SWCU194 March   2023 CC1314R10 , CC1354P10 , CC1354R10 , CC2674P10 , CC2674R10

 

  1.   Read This First
    1.     About This Manual
    2.     Devices
    3.     Register, Field, and Bit Calls
    4.     Related Documentation
    5.     Trademarks
  2. 1 Architectural Overview
    1. 1.1 Target Applications
    2. 1.2 Overview
    3. 1.3 Functional Overview
      1. 1.3.1  ArmCortex-M33 with FPU
        1. 1.3.1.1 Processor Core
        2. 1.3.1.2 System Timer (SysTick)
        3. 1.3.1.3 Nested Vector Interrupt Controller (NVIC)
        4. 1.3.1.4 System Control Block (SCB)
      2. 1.3.2  On-Chip Memory
        1. 1.3.2.1 SRAM
        2. 1.3.2.2 Flash Memory
        3. 1.3.2.3 ROM
      3. 1.3.3  Radio
      4. 1.3.4  Security Core
      5. 1.3.5  Runtime Security
      6. 1.3.6  General-Purpose Timers
        1. 1.3.6.1 Watchdog Timer
        2. 1.3.6.2 Always-On Domain
      7. 1.3.7  Direct Memory Access
      8. 1.3.8  System Control and Clock
      9. 1.3.9  Serial Communication Peripherals
        1. 1.3.9.1 UART
        2. 1.3.9.2 I2C
        3. 1.3.9.3 I2S
        4. 1.3.9.4 SPI
      10. 1.3.10 Programmable I/Os
      11. 1.3.11 Sensor Controller
      12. 1.3.12 Random Number Generator
      13. 1.3.13 cJTAG and JTAG
      14. 1.3.14 Power Supply System
        1. 1.3.14.1 Supply System
          1. 1.3.14.1.1 VDDS
          2. 1.3.14.1.2 VDDR
          3. 1.3.14.1.3 Digital Core Supply
          4. 1.3.14.1.4 Other Internal Supplies
        2. 1.3.14.2 DC/DC Converter
  3. 2  Arm Cortex-M33 Processor with FPU
    1. 2.1 Arm Cortex-M33 Processor Introduction
    2. 2.2 Block Diagram
    3. 2.3 Overview
      1. 2.3.1 Integrated Configurable Debug
      2. 2.3.2 Trace Port Interface Unit
      3. 2.3.3 Arm Cortex-M33 System Peripheral Details
        1. 2.3.3.1 Floating Point Unit (FPU)
        2. 2.3.3.2 Memory Protection Unit (MPU)
        3. 2.3.3.3 System Timer (SysTick)
        4. 2.3.3.4 Nested Vectored Interrupt Controller (NVIC)
        5. 2.3.3.5 System Control Block (SCB)
        6. 2.3.3.6 System Control Space (SCS)
        7. 2.3.3.7 Security Attribution Unit (SAU)
    4. 2.4 Programming Model
      1. 2.4.1 Modes of Operation and Execution
        1. 2.4.1.1 Security States
        2. 2.4.1.2 Operating Modes
        3. 2.4.1.3 Operating States
        4. 2.4.1.4 Privileged Access and Unprivileged User Access
      2. 2.4.2 Instruction Set Summary
      3. 2.4.3 Memory Model
        1. 2.4.3.1 Private Peripheral Bus
        2. 2.4.3.2 Unaligned Accesses
      4. 2.4.4 Exclusive Monitor
      5. 2.4.5 Processor Core Registers Summary
      6. 2.4.6 Exceptions
        1. 2.4.6.1 Exception Handling and Prioritization
      7. 2.4.7 Runtime Security
        1. 2.4.7.1 IDAU Watermark Registers
        2. 2.4.7.2 Secure Memory Range for Registers
        3. 2.4.7.3 Bus Topology
        4. 2.4.7.4 Intended Use
    5. 2.5 Arm® Cortex®-M33 Registers
      1. 2.5.1  CPU_ITM Registers
      2. 2.5.2  CPU_DWT Registers
      3. 2.5.3  CPU_SYSTICK Registers
      4. 2.5.4  CPU_NVIC Registers
      5. 2.5.5  CPU_SCS Registers
      6. 2.5.6  CPU_MPU Registers
      7. 2.5.7  CPU_SAU Registers
      8. 2.5.8  CPU_DCB Registers
      9. 2.5.9  CPU_SIG Registers
      10. 2.5.10 CPU_FPU Registers
      11. 2.5.11 CPU_TPIU Registers
  4. 3 Memory Map
    1. 3.1 Introduction
    2. 3.2 Memory Map (Secure and Non-secure)
      1. 3.2.1 Bus Security
    3. 3.3 Memory Map
  5. 4  Arm Cortex-M33 Peripherals
    1. 4.1 Arm Cortex-M33 Peripherals Introduction
  6. 5 Interrupts and Events
    1. 5.1 Exception Model
      1. 5.1.1 Exception States
      2. 5.1.2 Exception Types
      3. 5.1.3 Exception Handlers
      4. 5.1.4 Vector Table
      5. 5.1.5 Exception Priorities
      6. 5.1.6 Interrupt Priority Grouping
      7. 5.1.7 Exception Entry and Return
        1. 5.1.7.1 Exception Entry
        2. 5.1.7.2 Exception Return
    2. 5.2 Fault Handling
      1. 5.2.1 Fault Types
      2. 5.2.2 Fault Escalation and Hard Faults
      3. 5.2.3 Fault Status Registers and Fault Address Registers
      4. 5.2.4 Lockup
    3. 5.3 Security State Switches
    4. 5.4 Event Fabric
      1. 5.4.1 Introduction
      2. 5.4.2 Event Fabric Overview
        1. 5.4.2.1 Registers
    5. 5.5 AON Event Fabric
      1. 5.5.1 Common Input Event List
      2. 5.5.2 Event Subscribers
        1. 5.5.2.1 AON Power Management Controller (AON_PMCTL)
        2. 5.5.2.2 Real-Time Clock
        3. 5.5.2.3 MCU Event Fabric
    6. 5.6 MCU Event Fabric
      1. 5.6.1 Common Input Event List
      2. 5.6.2 Event Subscribers
        1. 5.6.2.1 System CPU
        2. 5.6.2.2 NMI
        3. 5.6.2.3 Freeze
    7. 5.7 AON Events
    8. 5.8 Interrupts and Events Registers
      1. 5.8.1 AON_EVENT Registers
      2. 5.8.2 EVENT Registers
  7. 6 JTAG Interface
    1. 6.1 Overview
    2. 6.2 cJTAG
    3. 6.3 ICEPick
      1. 6.3.1 Secondary TAPs
        1. 6.3.1.1 Slave DAP (CPU DAP)
      2. 6.3.2 ICEPick Registers
        1. 6.3.2.1 IR Instructions
        2. 6.3.2.2 Data Shift Register
        3. 6.3.2.3 Instruction Register
        4. 6.3.2.4 Bypass Register
        5. 6.3.2.5 Device Identification Register
        6. 6.3.2.6 User Code Register
        7. 6.3.2.7 ICEPick Identification Register
        8. 6.3.2.8 Connect Register
      3. 6.3.3 Router Scan Chain
      4. 6.3.4 TAP Routing Registers
        1. 6.3.4.1 ICEPick Control Block
          1. 6.3.4.1.1 All0s Register
          2. 6.3.4.1.2 ICEPick Control Register
          3. 6.3.4.1.3 Linking Mode Register
        2. 6.3.4.2 Test TAP Linking Block
          1. 6.3.4.2.1 Secondary Test TAP Register
        3. 6.3.4.3 Debug TAP Linking Block
          1. 6.3.4.3.1 Secondary Debug TAP Register
    4. 6.4 ICEMelter
    5. 6.5 Serial Wire Viewer (SWV)
    6. 6.6 Halt In Boot (HIB)
    7. 6.7 Debug and Shutdown
    8. 6.8 Boundary Scan
  8. 7 Power, Reset, and Clock Management (PRCM)
    1. 7.1 Introduction
    2. 7.2 System CPU Mode
    3. 7.3 Supply System
      1. 7.3.1 Internal DC/DC Converter and Global LDO
      2. 7.3.2 External Regulator Mode
    4. 7.4 Digital Power Partitioning
      1. 7.4.1 MCU_VD
        1. 7.4.1.1 MCU_VD Power Domains
      2. 7.4.2 AON_VD
        1. 7.4.2.1 AON_VD Power Domains
    5. 7.5 Clock Management
      1. 7.5.1 System Clocks
        1. 7.5.1.1 Controlling the Oscillators
      2. 7.5.2 Clocks in MCU_VD
        1. 7.5.2.1 Clock Gating
        2. 7.5.2.2 Scaler to GPTs
        3. 7.5.2.3 Scaler to WDT
      3. 7.5.3 Clocks in AON_VD
    6. 7.6 Power Modes
      1. 7.6.1 Start-Up State
      2. 7.6.2 Active Mode
      3. 7.6.3 Idle Mode
      4. 7.6.4 Standby Mode
      5. 7.6.5 Shutdown Mode
    7. 7.7 Reset
      1. 7.7.1 System Resets
        1. 7.7.1.1 Clock Loss Detection
        2. 7.7.1.2 Software-Initiated System Reset
        3. 7.7.1.3 Warm Reset Converted to System Reset
      2. 7.7.2 Reset of the MCU_VD Power Domains and Modules
      3. 7.7.3 Reset of AON_VD
      4. 7.7.4 Always On Watchdog Timer (AON_WDT)
    8. 7.8 PRCM Registers
      1. 7.8.1 PRCM Registers
      2. 7.8.2 AON_PMCTL Registers
      3. 7.8.3 DDI_0_OSC Registers
  9. 8 Versatile Instruction Memory System (VIMS)
    1. 8.1 Introduction
    2. 8.2 VIMS Configurations
      1. 8.2.1 VIMS Modes
        1. 8.2.1.1 GPRAM Mode
        2. 8.2.1.2 Off Mode
        3. 8.2.1.3 Cache Mode
      2. 8.2.2 VIMS FLASH Line Buffers
      3. 8.2.3 VIMS Arbitration
      4. 8.2.4 VIMS Cache TAG Prefetch
    3. 8.3 VIMS Software Remarks
      1. 8.3.1 FLASH Program or Update
      2. 8.3.2 VIMS Retention
        1. 8.3.2.1 Mode 1
        2. 8.3.2.2 Mode 2
        3. 8.3.2.3 Mode 3
    4. 8.4 FLASH
      1. 8.4.1 Flash Memory Protection
      2. 8.4.2 Flash Memory Programming
    5. 8.5 ROM Functions
    6. 8.6 VIMS Registers
      1. 8.6.1 FLASH Registers
      2. 8.6.2 VIMS Registers
      3. 8.6.3 NVMNW Registers
  10. 9 SRAM
    1. 9.1 Introduction
    2. 9.2 Main Features
    3. 9.3 Data Retention
    4. 9.4 Parity and SRAM Error Support
      1. 9.4.1 SRAM Extension Mode
    5. 9.5 SRAM Auto-Initialization
    6. 9.6 Parity Debug Behavior
    7. 9.7 SRAM Registers
      1. 9.7.1 SRAM_MMR Registers
      2. 9.7.2 SRAM Registers
  11. 10Bootloader
    1. 10.1 Bootloader Functionality
      1. 10.1.1 Bootloader Disabling
      2. 10.1.2 Bootloader Backdoor
    2. 10.2 Bootloader Interfaces
      1. 10.2.1 Packet Handling
        1. 10.2.1.1 Packet Acknowledge and Not-Acknowledge Bytes
      2. 10.2.2 Transport Layer
        1. 10.2.2.1 UART Transport
          1. 10.2.2.1.1 UART Baud Rate Automatic Detection
        2. 10.2.2.2 SPI Transport
      3. 10.2.3 Serial Bus Commands
        1. 10.2.3.1  COMMAND_PING
        2. 10.2.3.2  COMMAND_DOWNLOAD
        3. 10.2.3.3  COMMAND_GET_STATUS
        4. 10.2.3.4  COMMAND_SEND_DATA
        5. 10.2.3.5  COMMAND_RESET
        6. 10.2.3.6  COMMAND_SECTOR_ERASE
        7. 10.2.3.7  COMMAND_CRC32
        8. 10.2.3.8  COMMAND_GET_CHIP_ID
        9. 10.2.3.9  COMMAND_MEMORY_READ
        10. 10.2.3.10 COMMAND_MEMORY_WRITE
        11. 10.2.3.11 COMMAND_BANK_ERASE
        12. 10.2.3.12 COMMAND_SET_CCFG
        13. 10.2.3.13 COMMAND_DOWNLOAD_CRC
  12. 11Device Configuration
    1. 11.1 Customer Configuration (CCFG)
      1. 11.1.1 CCFG Recommendations for Final Production
    2. 11.2 CCFG Registers
    3. 11.3 Factory Configuration (FCFG)
    4. 11.4 FCFG1 Registers
  13. 12AES and Hash Cryptoprocessor
    1. 12.1 Introduction
    2. 12.2 Functional Description
      1. 12.2.1 Debug Capabilities
      2. 12.2.2 Exception Handling
      3. 12.2.3 Power Management and Sleep Modes
      4. 12.2.4 Interrupts
      5. 12.2.5 Module Memory Map
      6. 12.2.6 Master Control and Select Module
        1. 12.2.6.1 Algorithm Select Register
          1. 12.2.6.1.1 Algorithm Select
        2. 12.2.6.2 Master PROT Enable
          1. 12.2.6.2.1 Master PROT-Privileged Access-Enable
        3. 12.2.6.3 Software Reset
      7. 12.2.7 AES Engine
        1. 12.2.7.1 Second and Third Key Registers (Internal, but Clearable)
        2. 12.2.7.2 AES Initialization Vector (IV) Registers
        3. 12.2.7.3 AES I/O Buffer Control, Mode, and Length Registers
        4. 12.2.7.4 AES Data Input and Output Registers
        5. 12.2.7.5 TAG Registers
      8. 12.2.8 Key Area Registers
        1. 12.2.8.1 Key Store Write Area Register
        2. 12.2.8.2 Key Store Written Area Register
        3. 12.2.8.3 Key Store Size Register
        4. 12.2.8.4 Key Store Read Area Register
      9. 12.2.9 Hash Engine
        1. 12.2.9.1 Hash I/O Buffer Control and Status Register, Mode, and Length Registers
        2. 12.2.9.2 Hash Data Input and Digest Registers
    3. 12.3 DMA Controller
      1. 12.3.1 Internal Operation
      2. 12.3.2 Supported DMA Operations
    4. 12.4 AES and Hash Cryptoprocessor Performance
      1. 12.4.1 Introduction
      2. 12.4.2 Performance for DMA-Based Operations
    5. 12.5 Programming Guidelines
      1. 12.5.1 One-Time Initialization After a Reset
      2. 12.5.2 DMAC and Master Control
        1. 12.5.2.1 Regular Use
        2. 12.5.2.2 Interrupting DMA Transfers
        3. 12.5.2.3 Interrupts, Hardware, and Software Synchronization
      3. 12.5.3 Hashing
        1. 12.5.3.1 Data Format and Byte Order
        2. 12.5.3.2 Basic Hash with Data From DMA
          1. 12.5.3.2.1 New Hash Session with Digest Read Through Slave
          2. 12.5.3.2.2 New Hash Session with Digest to External Memory
          3. 12.5.3.2.3 Resumed Hash Session
        3. 12.5.3.3 HMAC
          1. 12.5.3.3.1 Secure HMAC
        4. 12.5.3.4 Alternative Basic Hash Where Data Originates from Slave Interface
          1. 12.5.3.4.1 New Hash Session
          2. 12.5.3.4.2 Resumed Hash Session
      4. 12.5.4 Encryption and Decryption
        1. 12.5.4.1 Data Format and Byte Order
        2. 12.5.4.2 Key Store
          1. 12.5.4.2.1 Load Keys from External Memory
        3. 12.5.4.3 Basic AES Modes
          1. 12.5.4.3.1 AES-ECB
          2. 12.5.4.3.2 AES-CBC
          3. 12.5.4.3.3 AES-CTR
          4. 12.5.4.3.4 Programming Sequence with DMA Data
        4. 12.5.4.4 CBC-MAC
          1. 12.5.4.4.1 Programming Sequence for Regular CBC-MAC
          2. 12.5.4.4.2 Programming Sequence for Regular CBC-MAC with Continuation
          3. 12.5.4.4.3 Programming Sequence for CMAC CBC-MAC
          4. 12.5.4.4.4 Programming Sequence for CMAC CBC-MAC with Continuation
        5. 12.5.4.5 AES-CCM
          1. 12.5.4.5.1 Continued CCM Processing
          2. 12.5.4.5.2 Programming Sequence for AES-CCM
          3. 12.5.4.5.3 Programming Sequence for Continued AES-CCM in the AAD Phase
          4. 12.5.4.5.4 Programming Sequence for Continued AES-CCM in the Payload Phase
        6. 12.5.4.6 AES-GCM
          1. 12.5.4.6.1 Continued AES-GCM Processing
          2. 12.5.4.6.2 Programming Sequence for AES-GCM
          3. 12.5.4.6.3 Programming Sequence for Continued AES-GCM in the AAD Phase
          4. 12.5.4.6.4 Programming Sequence for Continued AES-GCM in the Payload Phase
      5. 12.5.5 Exceptions Handling
        1. 12.5.5.1 Soft Reset
        2. 12.5.5.2 External Port Errors
        3. 12.5.5.3 Key Store Errors
    6. 12.6 Conventions and Compliances
      1. 12.6.1 Conventions Used in This Manual
        1. 12.6.1.1 Terminology
        2. 12.6.1.2 Formulas and Nomenclature
      2. 12.6.2 Compliance
    7. 12.7 CRYPTO Registers
  14. 13PKA Engine
    1. 13.1 Introduction
    2. 13.2 Functional Description
      1. 13.2.1 Module Architecture
      2. 13.2.2 PKA RAM
      3. 13.2.3 PKCP Operations
      4. 13.2.4 Sequencer Operations
        1. 13.2.4.1 Modular Exponentiation Operations
        2. 13.2.4.2 Modular Inversion Operation
        3. 13.2.4.3 ECC Operations
      5. 13.2.5 Operation Sequence
    3. 13.3 PKA Engine Performance
      1. 13.3.1 Basic Operations Performance
      2. 13.3.2 ExpMod Performance
      3. 13.3.3 Modular Inversion Performance
      4. 13.3.4 ECC Operation Performance
    4. 13.4 PKA Registers
  15. 14True Random Number Generator (TRNG)
    1. 14.1 Introduction
    2. 14.2 Block Diagram
    3. 14.3 TRNG Software Reset
    4. 14.4 Interrupt Requests
    5. 14.5 TRNG Operation Description
      1. 14.5.1 TRNG Shutdown
      2. 14.5.2 TRNG Alarms
      3. 14.5.3 TRNG Entropy
    6. 14.6 TRNG Low-Level Programming Guide
      1. 14.6.1 Initialization
        1. 14.6.1.1 Interfacing Modules
        2. 14.6.1.2 TRNG Main Sequence
        3. 14.6.1.3 TRNG Operating Modes
          1. 14.6.1.3.1 Polling Mode
          2. 14.6.1.3.2 Interrupt Mode
    7. 14.7 TRNG Registers
  16. 15I/O Controller (IOC)
    1. 15.1  Introduction
    2. 15.2  IOC Overview
    3. 15.3  I/O Mapping and Configuration
      1. 15.3.1 Basic I/O Mapping
      2. 15.3.2 Mapping AUXIOs to DIO Pins
      3. 15.3.3 Control External LNA/PA (Range Extender) with I/Os
      4. 15.3.4 Map the 32 kHz System Clock (SCLK_LF Clock) to DIO
    4. 15.4  Edge Detection on DIO Pins
      1. 15.4.1 Configure DIO as GPIO Input to Generate Interrupt on Edge Detect
    5. 15.5  Unused I/O Pins
    6. 15.6  GPIO
    7. 15.7  I/O Pin Capability
    8. 15.8  Peripheral PORT_IDs
    9. 15.9  I/O Pins
      1. 15.9.1 Input/Output Modes
        1. 15.9.1.1 Physical Pin
        2. 15.9.1.2 Pin Configuration
    10. 15.10 IOC Registers
      1. 15.10.1 AON_IOC Registers
      2. 15.10.2 GPIO Registers
      3. 15.10.3 IOC Registers
  17. 16Micro Direct Memory Access (µDMA)
    1. 16.1 Introduction
    2. 16.2 Block Diagram
    3. 16.3 Functional Description
      1. 16.3.1  Channel Assignments
      2. 16.3.2  Priority
      3. 16.3.3  Arbitration Size
      4. 16.3.4  Request Types
        1. 16.3.4.1 Single Request
        2. 16.3.4.2 Burst Request
      5. 16.3.5  Channel Configuration
      6. 16.3.6  Transfer Modes
        1. 16.3.6.1 Stop Mode
        2. 16.3.6.2 Basic Mode
        3. 16.3.6.3 Auto Mode
        4. 16.3.6.4 Ping-Pong Mode
        5. 16.3.6.5 Memory Scatter-Gather Mode
        6. 16.3.6.6 Peripheral Scatter-Gather Mode
      7. 16.3.7  Transfer Size and Increments
      8. 16.3.8  Peripheral Interface
      9. 16.3.9  Software Request
      10. 16.3.10 Interrupts and Errors
    4. 16.4 Initialization and Configuration
      1. 16.4.1 Module Initialization
      2. 16.4.2 Configuring a Memory-to-Memory Transfer
        1. 16.4.2.1 Configure the Channel Attributes
        2. 16.4.2.2 Configure the Channel Control Structure
        3. 16.4.2.3 Start the Transfer
    5. 16.5 UDMA Registers
  18. 17Timers
    1. 17.1 Introduction
    2. 17.2 Block Diagram
    3. 17.3 Functional Description
      1. 17.3.1 GPTM Reset Conditions
      2. 17.3.2 Timer Modes
        1. 17.3.2.1 One-Shot or Periodic Timer Mode
        2. 17.3.2.2 Input Edge-Count Mode
        3. 17.3.2.3 Input Edge-Time Mode
        4. 17.3.2.4 PWM Mode
        5. 17.3.2.5 Wait-for-Trigger Mode
      3. 17.3.3 Synchronizing GPT Blocks
      4. 17.3.4 Accessing Concatenated 16- and 32-Bit GPTM Register Values
    4. 17.4 Initialization and Configuration
      1. 17.4.1 One-Shot and Periodic Timer Modes
      2. 17.4.2 Input Edge-Count Mode
      3. 17.4.3 Input Edge-Timing Mode
      4. 17.4.4 PWM Mode
      5. 17.4.5 Producing DMA Trigger Events
    5. 17.5 GPT Registers
  19. 18Real-Time Clock (RTC)
    1. 18.1 Introduction
    2. 18.2 Functional Specifications
      1. 18.2.1 Functional Overview
      2. 18.2.2 Free-Running Counter
      3. 18.2.3 Channels
        1. 18.2.3.1 Capture and Compare
      4. 18.2.4 Events
    3. 18.3 RTC Register Information
      1. 18.3.1 Register Access
      2. 18.3.2 Entering Sleep and Wakeup From Sleep
      3. 18.3.3 AON_RTC:SYNC Register
    4. 18.4 RTC Registers
      1. 18.4.1 AON_RTC Registers
  20. 19Watchdog Timer (WDT)
    1. 19.1 Introduction
    2. 19.2 Functional Description
    3. 19.3 Initialization and Configuration
    4. 19.4 WDT Registers
  21. 20AUX Domain Sensor Controller and Peripherals
    1. 20.1 Introduction
      1. 20.1.1 AUX Block Diagram
    2. 20.2 Power and Clock Management
      1. 20.2.1 Operational Modes
        1. 20.2.1.1 Dual-Rate AUX Clock
      2. 20.2.2 Use Scenarios
        1. 20.2.2.1 MCU
        2. 20.2.2.2 Sensor Controller
      3. 20.2.3 SCE Clock Emulation
      4. 20.2.4 AUX RAM Retention
    3. 20.3 Sensor Controller
      1. 20.3.1 Sensor Controller Studio
        1. 20.3.1.1 Programming Model
        2. 20.3.1.2 Task Development
        3. 20.3.1.3 Task Testing, Task Debugging and Run-Time Logging
        4. 20.3.1.4 Documentation
      2. 20.3.2 Sensor Controller Engine (SCE)
        1. 20.3.2.1  Registers
          1.        Pipeline Hazards
        2. 20.3.2.2  Memory Architecture
          1.        Memory Access to Instructions and Data
          2.        I/O Access to Module Registers
        3. 20.3.2.3  Program Flow
          1.        Zero-Overhead Loop
        4. 20.3.2.4  Instruction Set
          1. 20.3.2.4.1 Instruction Timing
          2. 20.3.2.4.2 Instruction Prefix
          3. 20.3.2.4.3 Instructions
        5. 20.3.2.5  SCE Event Interface
        6. 20.3.2.6  Math Accelerator (MAC)
        7. 20.3.2.7  Programmable Microsecond Delay
        8. 20.3.2.8  Wake-Up Event Handling
        9. 20.3.2.9  Access to AON Domain Registers
        10. 20.3.2.10 VDDR Recharge
    4. 20.4 Digital Peripheral Modules
      1. 20.4.1 Overview
        1. 20.4.1.1 DDI Control-Configuration
      2. 20.4.2 Analog I/O Digital I/O (AIODIO)
        1. 20.4.2.1 Introduction
        2. 20.4.2.2 Functional Description
          1. 20.4.2.2.1 Mapping to DIO Pins
          2. 20.4.2.2.2 Configuration
          3. 20.4.2.2.3 GPIO Mode
          4. 20.4.2.2.4 Input Buffer
          5. 20.4.2.2.5 Data Output Source
      3. 20.4.3 Semaphore (SMPH)
        1. 20.4.3.1 Introduction
        2. 20.4.3.2 Functional Description
        3. 20.4.3.3 Semaphore Allocation in TI Software
      4. 20.4.4 SPI Master (SPIM)
        1. 20.4.4.1 Introduction
        2. 20.4.4.2 Functional Description
          1. 20.4.4.2.1 TX and RX Operations
          2. 20.4.4.2.2 Configuration
          3. 20.4.4.2.3 Timing Diagrams
      5. 20.4.5 Time-to-Digital Converter (TDC)
        1. 20.4.5.1 Introduction
        2. 20.4.5.2 Functional Description
          1. 20.4.5.2.1 Command
          2. 20.4.5.2.2 Conversion Time Configuration
          3. 20.4.5.2.3 Status and Result
          4. 20.4.5.2.4 Clock Source Selection
            1. 20.4.5.2.4.1 Counter Clock
            2. 20.4.5.2.4.2 Reference Clock
          5. 20.4.5.2.5 Start and Stop Events
          6. 20.4.5.2.6 Prescaler
        3. 20.4.5.3 Supported Measurement Types
          1. 20.4.5.3.1 Measure Pulse Width
          2. 20.4.5.3.2 Measure Frequency
          3. 20.4.5.3.3 Measure Time Between Edges of Different Events Sources
            1. 20.4.5.3.3.1 Asynchronous Counter Start – Ignore 0 Stop Events
            2. 20.4.5.3.3.2 Synchronous Counter Start – Ignore 0 Stop Events
            3. 20.4.5.3.3.3 Asynchronous Counter Start – Ignore Stop Events
            4. 20.4.5.3.3.4 Synchronous Counter Start – Ignore Stop Events
          4. 20.4.5.3.4 Pulse Counting
      6. 20.4.6 Timer01
        1. 20.4.6.1 Introduction
        2. 20.4.6.2 Functional Description
      7. 20.4.7 Timer2
        1. 20.4.7.1 Introduction
        2. 20.4.7.2 Functional Description
          1. 20.4.7.2.1 Clock Source
          2. 20.4.7.2.2 Clock Prescaler
          3. 20.4.7.2.3 Counter
          4. 20.4.7.2.4 Event Outputs
          5. 20.4.7.2.5 Channel Actions
            1. 20.4.7.2.5.1 Period and Pulse Width Measurement
            2. 20.4.7.2.5.2 Clear on Zero, Toggle on Compare Repeatedly
            3. 20.4.7.2.5.3 Set on Zero, Toggle on Compare Repeatedly
          6. 20.4.7.2.6 Asynchronous Bus Bridge
    5. 20.5 Analog Peripheral Modules
      1. 20.5.1 Overview
        1. 20.5.1.1 ADI Control-Configuration
        2. 20.5.1.2 Block Diagram
      2. 20.5.2 Analog-to-Digital Converter (ADC)
        1. 20.5.2.1 Introduction
        2. 20.5.2.2 Functional Description
          1. 20.5.2.2.1 Input Selection and Scaling
          2. 20.5.2.2.2 Reference Selection
          3. 20.5.2.2.3 ADC Sample Mode
          4. 20.5.2.2.4 ADC Clock Source
          5. 20.5.2.2.5 ADC Trigger
          6. 20.5.2.2.6 Sample FIFO
          7. 20.5.2.2.7 µDMA Interface
          8. 20.5.2.2.8 Resource Ownership and Usage
      3. 20.5.3 Comparator A (COMPA)
        1. 20.5.3.1 Introduction
        2. 20.5.3.2 Functional Description
          1. 20.5.3.2.1 Input Selection
          2. 20.5.3.2.2 Reference Selection
          3. 20.5.3.2.3 LPM Bias and COMPA Enable
          4. 20.5.3.2.4 Resource Ownership and Usage
      4. 20.5.4 Comparator B (COMPB)
        1. 20.5.4.1 Introduction
        2. 20.5.4.2 Functional Description
          1. 20.5.4.2.1 Input Selection
          2. 20.5.4.2.2 Reference Selection
          3. 20.5.4.2.3 Resource Ownership and Usage
            1. 20.5.4.2.3.1 Sensor Controller Wakeup
            2. 20.5.4.2.3.2 System CPU Wakeup
      5. 20.5.5 Reference Digital-to-Analog Converter (DAC)
        1. 20.5.5.1 Introduction
        2. 20.5.5.2 Functional Description
          1. 20.5.5.2.1 Reference Selection
          2. 20.5.5.2.2 Output Voltage Control and Range
          3. 20.5.5.2.3 Sample Clock
            1. 20.5.5.2.3.1 Automatic Phase Control
            2. 20.5.5.2.3.2 Manual Phase Control
            3. 20.5.5.2.3.3 Operational Mode Dependency
          4. 20.5.5.2.4 Output Selection
            1. 20.5.5.2.4.1 Buffer
            2. 20.5.5.2.4.2 External Load
            3. 20.5.5.2.4.3 COMPA_REF
            4. 20.5.5.2.4.4 COMPB_REF
          5. 20.5.5.2.5 LPM Bias
          6. 20.5.5.2.6 Resource Ownership and Usage
      6. 20.5.6 Current Source (ISRC)
        1. 20.5.6.1 Introduction
        2. 20.5.6.2 Functional Description
          1. 20.5.6.2.1 Programmable Current
          2. 20.5.6.2.2 Voltage Reference
          3. 20.5.6.2.3 ISRC Enable
          4. 20.5.6.2.4 Temperature Dependency
          5. 20.5.6.2.5 Resource Ownership and Usage
    6. 20.6 Event Routing and Usage
      1. 20.6.1 AUX Event Bus
        1. 20.6.1.1 Event Signals
        2. 20.6.1.2 Event Subscribers
          1. 20.6.1.2.1 Event Detection
            1. 20.6.1.2.1.1 Detection of Asynchronous Events
            2. 20.6.1.2.1.2 Detection of Synchronous Events
      2. 20.6.2 Event Observation on External Pin
      3. 20.6.3 Events From MCU Domain
      4. 20.6.4 Events to MCU Domain
      5. 20.6.5 Events From AON Domain
      6. 20.6.6 Events to AON Domain
      7. 20.6.7 µDMA Interface
    7. 20.7 Sensor Controller Alias Register Space
    8. 20.8 AUX Domain Sensor Controller and Peripherals Registers
      1. 20.8.1  ADI_4_AUX Registers
      2. 20.8.2  AUX_AIODIO Registers
      3. 20.8.3  AUX_EVCTL Registers
      4. 20.8.4  AUX_SMPH Registers
      5. 20.8.5  AUX_TDC Registers
      6. 20.8.6  AUX_TIMER01 Registers
      7. 20.8.7  AUX_TIMER2 Registers
      8. 20.8.8  AUX_ANAIF Registers
      9. 20.8.9  AUX_SYSIF Registers
      10. 20.8.10 AUX_SPIM Registers
      11. 20.8.11 AUX_MAC Registers
      12. 20.8.12 AUX_SCE Registers
  22. 21Battery Monitor and Temperature Sensor (BATMON)
    1. 21.1 Introduction
    2. 21.2 Functional Description
    3. 21.3 AON_BATMON Registers
  23. 22Universal Asynchronous Receiver/Transmitter (UART)
    1. 22.1 Introduction
    2. 22.2 Block Diagram
    3. 22.3 Signal Description
    4. 22.4 Functional Description
      1. 22.4.1 Transmit and Receive Logic
      2. 22.4.2 Baud Rate Generation
      3. 22.4.3 Data Transmission
      4. 22.4.4 Modem Handshake Support
        1. 22.4.4.1 Signaling
        2. 22.4.4.2 Flow Control
          1. 22.4.4.2.1 Hardware Flow Control (RTS and CTS)
          2. 22.4.4.2.2 Software Flow Control (Modem Status Interrupts)
      5. 22.4.5 FIFO Operation
      6. 22.4.6 Interrupts
      7. 22.4.7 Loopback Operation
    5. 22.5 Interface to µDMA
    6. 22.6 Initialization and Configuration
    7. 22.7 UART Registers
  24. 23Serial Peripheral Interface (SPI)
    1. 23.1 Introduction
    2. 23.2 Block Diagram
    3. 23.3 Signal Description
    4. 23.4 Functional Description
      1. 23.4.1 Bit Rate Generation
      2. 23.4.2 FIFO Operation
        1. 23.4.2.1 Transmit FIFO
          1. 23.4.2.1.1 Repeated Transmit Operation
        2. 23.4.2.2 Receive FIFO
        3. 23.4.2.3 FIFO Flush
      3. 23.4.3 Interrupts
      4. 23.4.4 Data Format
      5. 23.4.5 Delayed Data Sampling
      6. 23.4.6 Frame Formats
        1. 23.4.6.1 Texas Instruments Synchronous Serial Frame Format
        2. 23.4.6.2 Motorola SPI Frame Format
          1. 23.4.6.2.1 SPO Clock Polarity Bit
          2. 23.4.6.2.2 SPH Phase Control Bit
        3. 23.4.6.3 Motorola SPI Frame Format with SPO = 0 and SPH = 0
        4. 23.4.6.4 Motorola SPI Frame Format with SPO = 0 and SPH = 1
        5. 23.4.6.5 Motorola SPI Frame Format with SPO = 1 and SPH = 0
        6. 23.4.6.6 Motorola SPI Frame Format with SPO = 1 and SPH = 1
        7. 23.4.6.7 MICROWIRE Frame Format
    5. 23.5 μDMA Operation
    6. 23.6 Initialization and Configuration
    7. 23.7 SPI Registers
  25. 24Inter-Integrated Circuit (I2C)
    1. 24.1 Introduction
    2. 24.2 Block Diagram
    3. 24.3 Functional Description
      1. 24.3.1 I2C Bus Functional Overview
        1. 24.3.1.1 Start and Stop Conditions
        2. 24.3.1.2 Data Format with 7-Bit Address
        3. 24.3.1.3 Data Validity
        4. 24.3.1.4 Acknowledge
        5. 24.3.1.5 Arbitration
      2. 24.3.2 Available Speed Modes
        1. 24.3.2.1 Standard and Fast Modes
      3. 24.3.3 Interrupts
        1. 24.3.3.1 I2C Master Interrupts
        2. 24.3.3.2 I2C Slave Interrupts
      4. 24.3.4 Loopback Operation
      5. 24.3.5 Command Sequence Flow Charts
        1. 24.3.5.1 I2C Master Command Sequences
        2. 24.3.5.2 I2C Slave Command Sequences
    4. 24.4 Initialization and Configuration
    5. 24.5 I2C Registers
  26. 25Inter-IC Sound (I2S)
    1. 25.1 Introduction
    2. 25.2 Block Diagram
    3. 25.3 Signal Description
    4. 25.4 Functional Description
      1. 25.4.1 Dependencies
        1. 25.4.1.1 System CPU Deep-Sleep Mode
      2. 25.4.2 Pin Configuration
      3. 25.4.3 Serial Format Configuration
      4. 25.4.4 I2S
        1. 25.4.4.1 Register Configuration
      5. 25.4.5 Left-Justified (LJF)
        1. 25.4.5.1 Register Configuration
      6. 25.4.6 Right-Justified (RJF)
        1. 25.4.6.1 Register Configuration
      7. 25.4.7 DSP
        1. 25.4.7.1 Register Configuration
      8. 25.4.8 Clock Configuration
        1. 25.4.8.1 Internal Audio Clock Source
        2. 25.4.8.2 External Audio Clock Source
    5. 25.5 Memory Interface
      1. 25.5.1 Sample Word Length
      2. 25.5.2 Channel Mapping
      3. 25.5.3 Sample Storage in Memory
      4. 25.5.4 DMA Operation
        1. 25.5.4.1 Start-Up
        2. 25.5.4.2 Operation
        3. 25.5.4.3 Shutdown
    6. 25.6 Samplestamp Generator
      1. 25.6.1 Samplestamp Counters
      2. 25.6.2 Start-Up Triggers
      3. 25.6.3 Samplestamp Capture
      4. 25.6.4 Achieving Constant Audio Latency
    7. 25.7 Error Detection
    8. 25.8 Usage
      1. 25.8.1 Start-Up Sequence
      2. 25.8.2 Shutdown Sequence
    9. 25.9 I2S Registers
  27. 26Radio
    1. 26.1  RF Core
      1. 26.1.1 High-Level Description and Overview
    2. 26.2  Radio Doorbell
      1. 26.2.1 Special Boot Process
      2. 26.2.2 Command and Status Register and Events
      3. 26.2.3 RF Core Interrupts
        1. 26.2.3.1 RF Command and Packet Engine Interrupts
        2. 26.2.3.2 RF Core Hardware Interrupts
        3. 26.2.3.3 RF Core Command Acknowledge Interrupt
      4. 26.2.4 Radio Timer
        1. 26.2.4.1 Compare and Capture Events
        2. 26.2.4.2 Radio Timer Outputs
        3. 26.2.4.3 Synchronization with Real-Time Clock
    3. 26.3  RF Core HAL
      1. 26.3.1 Hardware Support
      2. 26.3.2 Firmware Support
        1. 26.3.2.1 Commands
        2. 26.3.2.2 Command Status
        3. 26.3.2.3 Interrupts
        4. 26.3.2.4 Passing Data
        5. 26.3.2.5 Command Scheduling
          1. 26.3.2.5.1 Triggers
          2. 26.3.2.5.2 Conditional Execution
          3. 26.3.2.5.3 Handling Before Start of Command
        6. 26.3.2.6 Command Data Structures
          1. 26.3.2.6.1 Radio Operation Command Structure
        7. 26.3.2.7 Data Entry Structures
          1. 26.3.2.7.1 Data Entry Queue
          2. 26.3.2.7.2 Data Entry
          3. 26.3.2.7.3 Pointer Entry
          4. 26.3.2.7.4 Partial Read RX Entry
        8. 26.3.2.8 External Signaling
      3. 26.3.3 Command Definitions
        1. 26.3.3.1 Protocol-Independent Radio Operation Commands
          1. 26.3.3.1.1  CMD_NOP: No Operation Command
          2. 26.3.3.1.2  CMD_RADIO_SETUP: Set Up Radio Settings Command
          3. 26.3.3.1.3  CMD_FS_POWERUP: Power Up Frequency Synthesizer
          4. 26.3.3.1.4  CMD_FS_POWERDOWN: Power Down Frequency Synthesizer
          5. 26.3.3.1.5  CMD_FS: Frequency Synthesizer Controls Command
          6. 26.3.3.1.6  CMD_FS_OFF: Turn Off Frequency Synthesizer
          7. 26.3.3.1.7  CMD_RX_TEST: Receiver Test Command
          8. 26.3.3.1.8  CMD_TX_TEST: Transmitter Test Command
          9. 26.3.3.1.9  CMD_SYNC_STOP_RAT: Synchronize and Stop Radio Timer Command
          10. 26.3.3.1.10 CMD_SYNC_START_RAT: Synchronously Start Radio Timer Command
          11. 26.3.3.1.11 CMD_COUNT: Counter Command
          12. 26.3.3.1.12 CMD_SCH_IMM: Run Immediate Command as Radio Operation
          13. 26.3.3.1.13 CMD_COUNT_BRANCH: Counter Command with Branch of Command Chain
          14. 26.3.3.1.14 CMD_PATTERN_CHECK: Check a Value in Memory Against a Pattern
        2. 26.3.3.2 Protocol-Independent Direct and Immediate Commands
          1. 26.3.3.2.1  CMD_ABORT: ABORT Command
          2. 26.3.3.2.2  CMD_STOP: Stop Command
          3. 26.3.3.2.3  CMD_GET_RSSI: Read RSSI Command
          4. 26.3.3.2.4  CMD_UPDATE_RADIO_SETUP: Update Radio Settings Command
          5. 26.3.3.2.5  CMD_TRIGGER: Generate Command Trigger
          6. 26.3.3.2.6  CMD_GET_FW_INFO: Request Information on the Firmware Being Run
          7. 26.3.3.2.7  CMD_START_RAT: Asynchronously Start Radio Timer Command
          8. 26.3.3.2.8  CMD_PING: Respond with Interrupt
          9. 26.3.3.2.9  CMD_READ_RFREG: Read RF Core Register
          10. 26.3.3.2.10 CMD_SET_RAT_CMP: Set RAT Channel to Compare Mode
          11. 26.3.3.2.11 CMD_SET_RAT_CPT: Set RAT Channel to Capture Mode
          12. 26.3.3.2.12 CMD_DISABLE_RAT_CH: Disable RAT Channel
          13. 26.3.3.2.13 CMD_SET_RAT_OUTPUT: Set RAT Output to a Specified Mode
          14. 26.3.3.2.14 CMD_ARM_RAT_CH: Arm RAT Channel
          15. 26.3.3.2.15 CMD_DISARM_RAT_CH: Disarm RAT Channel
          16. 26.3.3.2.16 CMD_SET_TX_POWER: Set Transmit Power
          17. 26.3.3.2.17 CMD_SET_TX20_POWER: Set Transmit Power of the 20 dBm PA
          18. 26.3.3.2.18 CMD_MODIFY_FS: Set New Synthesizer Frequency Without Recalibration
          19. 26.3.3.2.19 CMD_BUS_REQUEST: Request System BUS Available for RF Core
      4. 26.3.4 Immediate Commands for Data Queue Manipulation
        1. 26.3.4.1 CMD_ADD_DATA_ENTRY: Add Data Entry to Queue
        2. 26.3.4.2 CMD_REMOVE_DATA_ENTRY: Remove First Data Entry from Queue
        3. 26.3.4.3 CMD_FLUSH_QUEUE: Flush Queue
        4. 26.3.4.4 CMD_CLEAR_RX: Clear All RX Queue Entries
        5. 26.3.4.5 CMD_REMOVE_PENDING_ENTRIES: Remove Pending Entries from Queue
    4. 26.4  Data Queue Usage
      1. 26.4.1 Operations on Data Queues Available Only for Internal Radio CPU Operations
        1. 26.4.1.1 PROC_ALLOCATE_TX: Allocate TX Entry for Reading
        2. 26.4.1.2 PROC_FREE_DATA_ENTRY: Free Allocated Data Entry
        3. 26.4.1.3 PROC_FINISH_DATA_ENTRY: Finish Use of First Data Entry From Queue
        4. 26.4.1.4 PROC_ALLOCATE_RX: Allocate RX Buffer for Storing Data
        5. 26.4.1.5 PROC_FINISH_RX: Commit Received Data to RX Data Entry
      2. 26.4.2 Radio CPU Usage Model
        1. 26.4.2.1 Receive Queues
        2. 26.4.2.2 Transmit Queues
    5. 26.5  IEEE 802.15.4
      1. 26.5.1 IEEE 802.15.4 Commands
        1. 26.5.1.1 IEEE 802.15.4 Radio Operation Command Structures
        2. 26.5.1.2 IEEE 802.15.4 Immediate Command Structures
        3. 26.5.1.3 Output Structures
        4. 26.5.1.4 Other Structures and Bit Fields
      2. 26.5.2 Interrupts
      3. 26.5.3 Data Handling
        1. 26.5.3.1 Receive Buffers
        2. 26.5.3.2 Transmit Buffers
      4. 26.5.4 Radio Operation Commands
        1. 26.5.4.1 RX Operation
          1. 26.5.4.1.1 Frame Filtering and Source Matching
            1. 26.5.4.1.1.1 Frame Filtering
            2. 26.5.4.1.1.2 Source Matching
          2. 26.5.4.1.2 Frame Reception
          3. 26.5.4.1.3 ACK Transmission
          4. 26.5.4.1.4 End of Receive Operation
          5. 26.5.4.1.5 CCA Monitoring
        2. 26.5.4.2 Energy Detect Scan Operation
        3. 26.5.4.3 CSMA-CA Operation
        4. 26.5.4.4 Transmit Operation
        5. 26.5.4.5 Receive Acknowledgment Operation
        6. 26.5.4.6 Abort Background-Level Operation Command
      5. 26.5.5 Immediate Commands
        1. 26.5.5.1 Modify CCA Parameter Command
        2. 26.5.5.2 Modify Frame-Filtering Parameter Command
        3. 26.5.5.3 Enable or Disable Source Matching Entry Command
        4. 26.5.5.4 Abort Foreground-Level Operation Command
        5. 26.5.5.5 Stop Foreground-Level Operation Command
        6. 26.5.5.6 Request CCA and RSSI Information Command
    6. 26.6  Bluetooth® Low Energy
      1. 26.6.1 Bluetooth® Low Energy Commands
        1. 26.6.1.1 Command Data Definitions
          1. 26.6.1.1.1 Bluetooth® Low Energy Command Structures
        2. 26.6.1.2 Parameter Structures
        3. 26.6.1.3 Output Structures
        4. 26.6.1.4 Other Structures and Bit Fields
      2. 26.6.2 Interrupts
    7. 26.7  Data Handling
      1. 26.7.1 Receive Buffers
      2. 26.7.2 Transmit Buffers
    8. 26.8  Radio Operation Command Descriptions
      1. 26.8.1  Bluetooth® 5 Radio Setup Command
      2. 26.8.2  Radio Operation Commands for Bluetooth® Low Energy Packet Transfer
      3. 26.8.3  Coding Selection for Coded PHY
      4. 26.8.4  Parameter Override
      5. 26.8.5  Link Layer Connection
      6. 26.8.6  Slave Command
      7. 26.8.7  Master Command
      8. 26.8.8  Legacy Advertiser
        1. 26.8.8.1 Connectable Undirected Advertiser Command
        2. 26.8.8.2 Connectable Directed Advertiser Command
        3. 26.8.8.3 Non-connectable Advertiser Command
        4. 26.8.8.4 Scannable Undirected Advertiser Command
      9. 26.8.9  Bluetooth® 5 Advertiser Commands
        1. 26.8.9.1 Common Extended Advertising Packets
        2. 26.8.9.2 Extended Advertiser Command
        3. 26.8.9.3 Secondary Channel Advertiser Command
      10. 26.8.10 Scanner Commands
        1. 26.8.10.1 Scanner Receiving Legacy Advertising Packets on Primary Channel
        2. 26.8.10.2 Scanner Receiving Extended Advertising Packets on Primary Channel
        3. 26.8.10.3 Scanner Receiving Extended Advertising Packets on Secondary Channel
        4. 26.8.10.4 ADI Filtering
        5. 26.8.10.5 End of Scanner Commands
      11. 26.8.11 Initiator Command
        1. 26.8.11.1 Initiator Receiving Legacy Advertising Packets on Primary Channel
        2. 26.8.11.2 Initiator Receiving Extended Advertising Packets on Primary Channel
        3. 26.8.11.3 Initiator Receiving Extended Advertising Packets on Secondary Channel
        4. 26.8.11.4 Automatic Window Offset Insertion
        5. 26.8.11.5 End of Initiator Commands
      12. 26.8.12 Generic Receiver Command
      13. 26.8.13 PHY Test Transmit Command
      14. 26.8.14 Whitelist Processing
      15. 26.8.15 Backoff Procedure
      16. 26.8.16 AUX Pointer Processing
      17. 26.8.17 Dynamic Change of Device Address
    9. 26.9  Immediate Commands
      1. 26.9.1 Update Advertising Payload Command
    10. 26.10 Proprietary Radio
      1. 26.10.1 Packet Formats
      2. 26.10.2 Commands
        1. 26.10.2.1 Command Data Definitions
          1. 26.10.2.1.1 Command Structures
        2. 26.10.2.2 Output Structures
        3. 26.10.2.3 Other Structures and Bit Fields
      3. 26.10.3 Interrupts
      4. 26.10.4 Data Handling
        1. 26.10.4.1 Receive Buffers
        2. 26.10.4.2 Transmit Buffers
      5. 26.10.5 Radio Operation Command Descriptions
        1. 26.10.5.1 End of Operation
        2. 26.10.5.2 Proprietary Mode Setup Command
          1. 26.10.5.2.1 IEEE 802.15.4g Packet Format
        3. 26.10.5.3 Transmitter Commands
          1. 26.10.5.3.1 Standard Transmit Command, CMD_PROP_TX
          2. 26.10.5.3.2 Advanced Transmit Command, CMD_PROP_TX_ADV
        4. 26.10.5.4 Receiver Commands
          1. 26.10.5.4.1 Standard Receive Command, CMD_PROP_RX
          2. 26.10.5.4.2 Advanced Receive Command, CMD_PROP_RX_ADV
        5. 26.10.5.5 Carrier-Sense Operation
          1. 26.10.5.5.1 Common Carrier-Sense Description
          2. 26.10.5.5.2 Carrier-Sense Command, CMD_PROP_CS
          3. 26.10.5.5.3 Sniff Mode Receiver Commands, CMD_PROP_RX_SNIFF and CMD_PROP_RX_ADV_SNIFF
      6. 26.10.6 Immediate Commands
        1. 26.10.6.1 Set Packet Length Command, CMD_PROP_SET_LEN
        2. 26.10.6.2 Restart Packet RX Command, CMD_PROP_RESTART_RX
    11. 26.11 Radio Registers
      1. 26.11.1 RFC_RAT Registers
      2. 26.11.2 RFC_DBELL Registers
      3. 26.11.3 RFC_PWR Registers
  28. 27Revision History

22.7 UART Registers

Table 22-3 lists the memory-mapped registers for the UART registers. All register offset addresses not listed in Table 22-3 should be considered as reserved locations and the register contents should not be modified.

Table 22-3 UART Registers
OffsetAcronymRegister NameSection
0hDRDataSection 22.7.1
4hRSRStatusSection 22.7.2
4hECRError ClearSection 22.7.3
18hFRFlagSection 22.7.4
24hIBRDInteger Baud-Rate DivisorSection 22.7.5
28hFBRDFractional Baud-Rate DivisorSection 22.7.6
2ChLCRHLine ControlSection 22.7.7
30hCTLControlSection 22.7.8
34hIFLSInterrupt FIFO Level SelectSection 22.7.9
38hIMSCInterrupt Mask Set/ClearSection 22.7.10
3ChRISRaw Interrupt StatusSection 22.7.11
40hMISMasked Interrupt StatusSection 22.7.12
44hICRInterrupt ClearSection 22.7.13
48hDMACTLDMA ControlSection 22.7.14

Complex bit access types are encoded to fit into small table cells. Table 22-4 shows the codes that are used for access types in this section.

Table 22-4 UART Access Type Codes
Access TypeCodeDescription
Read Type
RRRead
Write Type
WWWrite
Reset or Default Value
-nValue after reset or the default value

22.7.1 DR Register (Offset = 0h) [Reset = 00000000h]

DR is shown in Table 22-5.

Return to the Summary Table.

Data
For words to be transmitted:
- if the FIFOs are enabled (LCRH.FEN = 1), data written to this location is pushed onto the transmit FIFO
- if the FIFOs are not enabled (LCRH.FEN = 0), data is stored in the transmitter holding register (the bottom word of the transmit FIFO).
The write operation initiates transmission from the UART. The data is prefixed with a start bit, appended with the appropriate parity bit (if parity is enabled), and a stop bit.
The resultant word is then transmitted.
For received words:
- if the FIFOs are enabled (LCRH.FEN = 1), the data byte and the 4-bit status (break, frame, parity, and overrun) is pushed onto the 12-bit wide receive FIFO
- if the FIFOs are not enabled (LCRH.FEN = 0), the data byte and status are stored in the receiving holding register (the bottom word of the receive FIFO).
The received data byte is read by performing reads from this register along with the corresponding status information. The status information can also be read by a read of the RSR register.

Table 22-5 DR Register Field Descriptions
BitFieldTypeResetDescription
31-12RESERVEDR0hReserved
11OERXUART Overrun Error:
This bit is set to 1 if data is received and the receive FIFO is already full. The FIFO contents remain valid because no more data is written when the FIFO is full, , only the contents of the shift register are overwritten.
This is cleared to 0 once there is an empty space in the FIFO and a new character can be written to it.
10BERXUART Break Error:
This bit is set to 1 if a break condition was detected, indicating that the received data input (UARTRXD input pin) was held LOW for longer than a full-word transmission time (defined as start, data, parity and stop bits).
In FIFO mode, this error is associated with the character at the top of the FIFO (that is., the oldest received data character since last read). When a break occurs, a 0 character is loaded into the FIFO. The next character is enabled after the receive data input (UARTRXD input pin) goes to a 1 (marking state), and the next valid start bit is received.
9PERXUART Parity Error:
When set to 1, it indicates that the parity of the received data character does not match the parity that the LCRH.EPS and LCRH.SPS select.
In FIFO mode, this error is associated with the character at the top of the FIFO (that is, the oldest received data character since last read).
8FERXUART Framing Error:
When set to 1, it indicates that the received character did not have a valid stop bit (a valid stop bit is 1).
In FIFO mode, this error is associated with the character at the top of the FIFO (that is., the oldest received data character since last read).
7-0DATAR/WXData transmitted or received:
On writes, the transmit data character is pushed into the FIFO.
On reads, the oldest received data character since the last read is returned.

22.7.2 RSR Register (Offset = 4h) [Reset = 00000000h]

RSR is shown in Table 22-6.

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Status
This register is mapped to the same address as ECR register. Reads from this address are associated with RSR register and return the receive status. Writes to this address are associated with ECR register and clear the receive status flags (framing, parity, break, and overrun errors).
If the status is read from this register, then the status information for break, framing and parity corresponds to the data character read from the Data Register, DR prior to reading the RSR. The status information for overrun is set immediately when an overrun condition occurs.

Table 22-6 RSR Register Field Descriptions
BitFieldTypeResetDescription
31-4RESERVEDR0hReserved
3OER0hUART Overrun Error:
This bit is set to 1 if data is received and the receive FIFO is already full. The FIFO contents remain valid because no more data is written when the FIFO is full, , only the contents of the shift register are overwritten.
This is cleared to 0 once there is an empty space in the FIFO and a new character can be written to it.
2BER0hUART Break Error:
This bit is set to 1 if a break condition was detected, indicating that the received data input (UARTRXD input pin) was held LOW for longer than a full-word transmission time (defined as start, data, parity and stop bits).
When a break occurs, a 0 character is loaded into the FIFO. The next character is enabled after the receive data input (UARTRXD input pin) goes to a 1 (marking state), and the next valid start bit is received.
1PER0hUART Parity Error:
When set to 1, it indicates that the parity of the received data character does not match the parity that the LCRH.EPS and LCRH.SPS select.
0FER0hUART Framing Error:
When set to 1, it indicates that the received character did not have a valid stop bit (a valid stop bit is 1).

22.7.3 ECR Register (Offset = 4h) [Reset = 00000000h]

ECR is shown in Table 22-7.

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Error Clear
This register is mapped to the same address as RSR register. Reads from this address are associated with RSR register and return the receive status. Writes to this address are associated with ECR register and clear the receive status flags (framing, parity, break, and overrun errors).

Table 22-7 ECR Register Field Descriptions
BitFieldTypeResetDescription
31-4RESERVEDR0hReserved
3OEW0hThe framing (FE), parity (PE), break (BE) and overrun (OE) errors are cleared to 0 by any write to this register.
2BEW0hThe framing (FE), parity (PE), break (BE) and overrun (OE) errors are cleared to 0 by any write to this register.
1PEW0hThe framing (FE), parity (PE), break (BE) and overrun (OE) errors are cleared to 0 by any write to this register.
0FEW0hThe framing (FE), parity (PE), break (BE) and overrun (OE) errors are cleared to 0 by any write to this register.

22.7.4 FR Register (Offset = 18h) [Reset = 00000090h]

FR is shown in Table 22-8.

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Flag
Reads from this register return the UART flags.

Table 22-8 FR Register Field Descriptions
BitFieldTypeResetDescription
31-8RESERVEDR0hReserved
7TXFER1hUART Transmit FIFO Empty:
The meaning of this bit depends on the state of LCRH.FEN .
- If the FIFO is disabled, this bit is set when the transmit holding register is empty.
- If the FIFO is enabled, this bit is set when the transmit FIFO is empty.
This bit does not indicate if there is data in the transmit shift register.
6RXFFR0hUART Receive FIFO Full:
The meaning of this bit depends on the state of LCRH.FEN.
- If the FIFO is disabled, this bit is set when the receive holding register is full.
- If the FIFO is enabled, this bit is set when the receive FIFO is full.
5TXFFR0hUART Transmit FIFO Full:
Transmit FIFO full. The meaning of this bit depends on the state of LCRH.FEN.
- If the FIFO is disabled, this bit is set when the transmit holding register is full.
- If the FIFO is enabled, this bit is set when the transmit FIFO is full.
4RXFER1hUART Receive FIFO Empty:
Receive FIFO empty. The meaning of this bit depends on the state of LCRH.FEN.
- If the FIFO is disabled, this bit is set when the receive holding register is empty.
- If the FIFO is enabled, this bit is set when the receive FIFO is empty.
3BUSYR0hUART Busy:
If this bit is set to 1, the UART is busy transmitting data. This bit remains set until the complete byte, including all the stop bits, has been sent from the shift register.
This bit is set as soon as the transmit FIFO becomes non-empty, regardless of whether the UART is enabled or not.
2-1RESERVEDR0hReserved
0CTSRXClear To Send:
This bit is the complement of the active-low UART CTS input pin.
That is, the bit is 1 when CTS input pin is LOW.

22.7.5 IBRD Register (Offset = 24h) [Reset = 00000000h]

IBRD is shown in Table 22-9.

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Integer Baud-Rate Divisor
If this register is modified while transmission or reception is on-going, the baud rate will not be updated until transmission or reception of the current character is complete.

Table 22-9 IBRD Register Field Descriptions
BitFieldTypeResetDescription
31-16RESERVEDR0hReserved
15-0DIVINTR/W0hThe integer baud rate divisor:
The baud rate divisor is calculated using the formula below:
Baud rate divisor = (UART reference clock frequency) / (16 * Baud rate)
Baud rate divisor must be minimum 1 and maximum 65535.
That is, DIVINT=0 does not give a valid baud rate.
Similarly, if DIVINT=0xFFFF, any non-zero values in FBRD.DIVFRAC will be illegal.
A valid value must be written to this field before the UART can be used for RX or TX operations.

22.7.6 FBRD Register (Offset = 28h) [Reset = 00000000h]

FBRD is shown in Table 22-10.

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Fractional Baud-Rate Divisor
If this register is modified while trasmission or reception is on-going, the baudrate will not be updated until transmission or reception of the current character is complete.

Table 22-10 FBRD Register Field Descriptions
BitFieldTypeResetDescription
31-6RESERVEDR0hReserved
5-0DIVFRACR/W0hFractional Baud-Rate Divisor:
The baud rate divisor is calculated using the formula below:
Baud rate divisor = (UART reference clock frequency) / (16 * Baud rate)
Baud rate divisor must be minimum 1 and maximum 65535.
That is, IBRD.DIVINT=0 does not give a valid baud rate.
Similarly, if IBRD.DIVINT=0xFFFF, any non-zero values in DIVFRAC will be illegal.
A valid value must be written to this field before the UART can be used for RX or TX operations.

22.7.7 LCRH Register (Offset = 2Ch) [Reset = 00000000h]

LCRH is shown in Table 22-11.

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Line Control

Table 22-11 LCRH Register Field Descriptions
BitFieldTypeResetDescription
31-8RESERVEDR0hReserved
7SPSR/W0hUART Stick Parity Select:
0: Stick parity is disabled
1: The parity bit is transmitted and checked as invert of EPS field (i.e. the parity bit is transmitted and checked as 1 when EPS = 0).
This bit has no effect when PEN disables parity checking and generation.
6-5WLENR/W0hUART Word Length:
These bits indicate the number of data bits transmitted or received in a frame.
0h = 5 : Word Length 5 bits
1h = 6 : Word Length 6 bits
2h = 7 : Word Length 7 bits
3h = 8 : Word Length 8 bits
4FENR/W0hUART Enable FIFOs
0h = FIFOs are disabled (character mode) that is, the FIFOs become 1-byte-deep holding registers.
1h = Transmit and receive FIFO buffers are enabled (FIFO mode)
3STP2R/W0hUART Two Stop Bits Select:
If this bit is set to 1, two stop bits are transmitted at the end of the frame. The receive logic does not check for two stop bits being received.
2EPSR/W0hUART Even Parity Select
0h = Odd parity: The UART generates or checks for an odd number of 1s in the data and parity bits.
1h = Even parity: The UART generates or checks for an even number of 1s in the data and parity bits.
1PENR/W0hUART Parity Enable
This bit controls generation and checking of parity bit.
0h = Parity is disabled and no parity bit is added to the data frame
1h = Parity checking and generation is enabled.
0BRKR/W0hUART Send Break
If this bit is set to 1, a low-level is continually output on the UARTTXD output pin, after completing transmission of the current character. For the proper execution of the break command, the
software must set this bit for at least two complete frames. For normal use, this bit must be cleared to 0.

22.7.8 CTL Register (Offset = 30h) [Reset = 00000300h]

CTL is shown in Table 22-12.

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Control

Table 22-12 CTL Register Field Descriptions
BitFieldTypeResetDescription
31-16RESERVEDR0hReserved
15CTSENR/W0hCTS hardware flow control enable
0h = CTS hardware flow control disabled
1h = CTS hardware flow control enabled
14RTSENR/W0hRTS hardware flow control enable
0h = RTS hardware flow control disabled
1h = RTS hardware flow control enabled
13-12RESERVEDR0hReserved
11RTSR/W0hRequest to Send
This bit is the complement of the active-low UART RTS output. That is, when the bit is programmed to a 1 then RTS output on the pins is LOW.
10RESERVEDR0hReserved
9RXER/W1hUART Receive Enable
If the UART is disabled in the middle of reception, it completes the current character before stopping.
0h = UART Receive disabled
1h = UART Receive enabled
8TXER/W1hUART Transmit Enable
If the UART is disabled in the middle of transmission, it completes the current character before stopping.
0h = UART Transmit disabled
1h = UART Transmit enabled
7LBER/W0hUART Loop Back Enable:
Enabling the loop-back mode connects the UARTTXD output from the UART to UARTRXD input of the UART.
0h = Loop Back disabled
1h = Loop Back enabled
6-1RESERVEDR0hReserved
0UARTENR/W0hUART Enable
0h = UART disabled
1h = UART enabled

22.7.9 IFLS Register (Offset = 34h) [Reset = 00000012h]

IFLS is shown in Table 22-13.

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Interrupt FIFO Level Select

Table 22-13 IFLS Register Field Descriptions
BitFieldTypeResetDescription
31-6RESERVEDR0hReserved
5-3RXSELR/W2hReceive interrupt FIFO level select:
This field sets the trigger points for the receive interrupt. Values 0b101-0b111 are reserved.
0h = 1_8 : Receive FIFO becomes >= 1/8 full
1h = 2_8 : Receive FIFO becomes >= 1/4 full
2h = 4_8 : Receive FIFO becomes >= 1/2 full
3h = 6_8 : Receive FIFO becomes >= 3/4 full
4h = 7_8 : Receive FIFO becomes >= 7/8 full
2-0TXSELR/W2hTransmit interrupt FIFO level select:
This field sets the trigger points for the transmit interrupt. Values 0b101-0b111 are reserved.
0h = 1_8 : Transmit FIFO becomes <= 1/8 full
1h = 2_8 : Transmit FIFO becomes <= 1/4 full
2h = 4_8 : Transmit FIFO becomes <= 1/2 full
3h = 6_8 : Transmit FIFO becomes <= 3/4 full
4h = 7_8 : Transmit FIFO becomes <= 7/8 full

22.7.10 IMSC Register (Offset = 38h) [Reset = 00000000h]

IMSC is shown in Table 22-14.

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Interrupt Mask Set/Clear

Table 22-14 IMSC Register Field Descriptions
BitFieldTypeResetDescription
31-12RESERVEDR0hReserved
11EOTIMR/W0hEnd of Transmission interrupt mask. A read returns the current mask for UART's EoT interrupt. On a write of 1, the mask of the EoT interrupt is set which means the interrupt state will be reflected in MIS.EOTMIS. A write of 0 clears the mask which means MIS.EOTMIS will not reflect the interrupt.
10OEIMR/W0hOverrun error interrupt mask. A read returns the current mask for UART's overrun error interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.OEMIS. A write of 0 clears the mask which means MIS.OEMIS will not reflect the interrupt.
9BEIMR/W0hBreak error interrupt mask. A read returns the current mask for UART's break error interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.BEMIS. A write of 0 clears the mask which means MIS.BEMIS will not reflect the interrupt.
8PEIMR/W0hParity error interrupt mask. A read returns the current mask for UART's parity error interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.PEMIS. A write of 0 clears the mask which means MIS.PEMIS will not reflect the interrupt.
7FEIMR/W0hFraming error interrupt mask. A read returns the current mask for UART's framing error interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.FEMIS. A write of 0 clears the mask which means MIS.FEMIS will not reflect the interrupt.
6RTIMR/W0hReceive timeout interrupt mask. A read returns the current mask for UART's receive timeout interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.RTMIS. A write of 0 clears the mask which means this bitfield will not reflect the interrupt.
The raw interrupt for receive timeout RIS.RTRIS cannot be set unless the mask is set (RTIM = 1). This is because the mask acts as an enable for power saving. That is, the same status can be read from MIS.RTMIS and RIS.RTRIS.
5TXIMR/W0hTransmit interrupt mask. A read returns the current mask for UART's transmit interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.TXMIS. A write of 0 clears the mask which means MIS.TXMIS will not reflect the interrupt.
4RXIMR/W0hReceive interrupt mask. A read returns the current mask for UART's receive interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.RXMIS. A write of 0 clears the mask which means MIS.RXMIS will not reflect the interrupt.
3-2RESERVEDR0hReserved
1CTSMIMR/W0hClear to Send (CTS) modem interrupt mask. A read returns the current mask for UART's clear to send interrupt. On a write of 1, the mask of the overrun error interrupt is set which means the interrupt state will be reflected in MIS.CTSMMIS. A write of 0 clears the mask which means MIS.CTSMMIS will not reflect the interrupt.
0RESERVEDR0hReserved

22.7.11 RIS Register (Offset = 3Ch) [Reset = 0000000Dh]

RIS is shown in Table 22-15.

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Raw Interrupt Status

Table 22-15 RIS Register Field Descriptions
BitFieldTypeResetDescription
31-12RESERVEDR0hReserved
11EOTRISR0hEnd of Transmission interrupt status:
This field returns the raw interrupt state of UART's end of transmission interrupt. End of transmission flag is set when all the Transmit data in the FIFO and on the TX Line is tranmitted.
10OERISR0hOverrun error interrupt status:
This field returns the raw interrupt state of UART's overrun error interrupt. Overrun error occurs if data is received and the receive FIFO is full.
9BERISR0hBreak error interrupt status:
This field returns the raw interrupt state of UART's break error interrupt. Break error is set when a break condition is detected, indicating that the received data input (UARTRXD input pin) was held LOW for longer than a full-word transmission time (defined as start, data, parity and stop bits).
8PERISR0hParity error interrupt status:
This field returns the raw interrupt state of UART's parity error interrupt. Parity error is set if the parity of the received data character does not match the parity that the LCRH.EPS and LCRH.SPS select.
7FERISR0hFraming error interrupt status:
This field returns the raw interrupt state of UART's framing error interrupt. Framing error is set if the received character does not have a valid stop bit (a valid stop bit is 1).
6RTRISR0hReceive timeout interrupt status:
This field returns the raw interrupt state of UART's receive timeout interrupt. The receive timeout interrupt is asserted when the receive FIFO is not empty, and no more data is received during a 32-bit period. The receive timeout interrupt is cleared either when the FIFO becomes empty through reading all the data, or when a 1 is written to ICR.RTIC.
The raw interrupt for receive timeout cannot be set unless the mask is set (IMSC.RTIM = 1). This is because the mask acts as an enable for power saving. That is, the same status can be read from MIS.RTMIS and RTRIS.
5TXRISR0hTransmit interrupt status:
This field returns the raw interrupt state of UART's transmit interrupt.
When FIFOs are enabled (LCRH.FEN = 1), the transmit interrupt is asserted if the number of bytes in transmit FIFO is equal to or lower than the programmed trigger level (IFLS.TXSEL). The transmit interrupt is cleared by writing data to the transmit FIFO until it becomes greater than the trigger level, or by clearing the interrupt through ICR.TXIC.
When FIFOs are disabled (LCRH.FEN = 0), that is they have a depth of one location, the transmit interrupt is asserted if there is no data present in the transmitters single location. It is cleared by performing a single write to the transmit FIFO, or by clearing the interrupt through ICR.TXIC.
4RXRISR0hReceive interrupt status:
This field returns the raw interrupt state of UART's receive interrupt.
When FIFOs are enabled (LCRH.FEN = 1), the receive interrupt is asserted if the receive FIFO reaches the programmed trigger
level (IFLS.RXSEL). The receive interrupt is cleared by reading data from the receive FIFO until it becomes less than the trigger level, or by clearing the interrupt through ICR.RXIC.
When FIFOs are disabled (LCRH.FEN = 0), that is they have a depth of one location, the receive interrupt is asserted if data is received
thereby filling the location. The receive interrupt is cleared by performing a single read of the receive FIFO, or by clearing the interrupt through ICR.RXIC.
3-2RESERVEDR0hReserved
1CTSRMISRXClear to Send (CTS) modem interrupt status:
This field returns the raw interrupt state of UART's clear to send interrupt.
0RESERVEDR0hReserved

22.7.12 MIS Register (Offset = 40h) [Reset = 00000000h]

MIS is shown in Table 22-16.

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Masked Interrupt Status

Table 22-16 MIS Register Field Descriptions
BitFieldTypeResetDescription
31-12RESERVEDR0hReserved
11EOTMISR0hEnd of Transmission interrupt status:
This field returns the masked interrupt state of the overrun interrupt which is the AND product of raw interrupt state RIS.EOTRIS and the mask setting IMSC.EOTIM.
10OEMISR0hOverrun error masked interrupt status:
This field returns the masked interrupt state of the overrun interrupt which is the AND product of raw interrupt state RIS.OERIS and the mask setting IMSC.OEIM.
9BEMISR0hBreak error masked interrupt status:
This field returns the masked interrupt state of the break error interrupt which is the AND product of raw interrupt state RIS.BERIS and the mask setting IMSC.BEIM.
8PEMISR0hParity error masked interrupt status:
This field returns the masked interrupt state of the parity error interrupt which is the AND product of raw interrupt state RIS.PERIS and the mask setting IMSC.PEIM.
7FEMISR0hFraming error masked interrupt status: Returns the masked interrupt state of the framing error interrupt which is the AND product of raw interrupt state RIS.FERIS and the mask setting IMSC.FEIM.
6RTMISR0hReceive timeout masked interrupt status:
Returns the masked interrupt state of the receive timeout interrupt.
The raw interrupt for receive timeout cannot be set unless the mask is set (IMSC.RTIM = 1). This is because the mask acts as an enable for power saving. That is, the same status can be read from RTMIS and RIS.RTRIS.
5TXMISR0hTransmit masked interrupt status:
This field returns the masked interrupt state of the transmit interrupt which is the AND product of raw interrupt state RIS.TXRIS and the mask setting IMSC.TXIM.
4RXMISR0hReceive masked interrupt status:
This field returns the masked interrupt state of the receive interrupt which is the AND product of raw interrupt state RIS.RXRIS and the mask setting IMSC.RXIM.
3-2RESERVEDR0hReserved
1CTSMMISR0hClear to Send (CTS) modem masked interrupt status:
This field returns the masked interrupt state of the clear to send interrupt which is the AND product of raw interrupt state RIS.CTSRMIS and the mask setting IMSC.CTSMIM.
0RESERVEDR0hReserved

22.7.13 ICR Register (Offset = 44h) [Reset = 00000000h]

ICR is shown in Table 22-17.

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Interrupt Clear
On a write of 1, the corresponding interrupt is cleared. A write of 0 has no effect.

Table 22-17 ICR Register Field Descriptions
BitFieldTypeResetDescription
31-12RESERVEDR0hReserved
11EOTICWXEnd of Transmission interrupt clear:
Writing 1 to this field clears the overrun error interrupt (RIS.EOTRIS). Writing 0 has no effect.
10OEICWXOverrun error interrupt clear:
Writing 1 to this field clears the overrun error interrupt (RIS.OERIS). Writing 0 has no effect.
9BEICWXBreak error interrupt clear:
Writing 1 to this field clears the break error interrupt (RIS.BERIS). Writing 0 has no effect.
8PEICWXParity error interrupt clear:
Writing 1 to this field clears the parity error interrupt (RIS.PERIS). Writing 0 has no effect.
7FEICWXFraming error interrupt clear:
Writing 1 to this field clears the framing error interrupt (RIS.FERIS). Writing 0 has no effect.
6RTICWXReceive timeout interrupt clear:
Writing 1 to this field clears the receive timeout interrupt (RIS.RTRIS). Writing 0 has no effect.
5TXICWXTransmit interrupt clear:
Writing 1 to this field clears the transmit interrupt (RIS.TXRIS). Writing 0 has no effect.
4RXICWXReceive interrupt clear:
Writing 1 to this field clears the receive interrupt (RIS.RXRIS). Writing 0 has no effect.
3-2RESERVEDWXSoftware should not rely on the value of a reserved. Writing any other value than the reset value may result in undefined behavior. Write 0
1CTSMICWXClear to Send (CTS) modem interrupt clear:
Writing 1 to this field clears the clear to send interrupt (RIS.CTSRMIS). Writing 0 has no effect.
0RESERVEDWXSoftware should not rely on the value of a reserved. Writing any other value than the reset value may result in undefined behavior. Write 0.

22.7.14 DMACTL Register (Offset = 48h) [Reset = 00000000h]

DMACTL is shown in Table 22-18.

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DMA Control

Table 22-18 DMACTL Register Field Descriptions
BitFieldTypeResetDescription
31-3RESERVEDR0hReserved
2DMAONERRR/W0hDMA on error. If this bit is set to 1, the DMA receive request outputs (for single and burst requests) are disabled when the UART error interrupt is asserted (more specifically if any of the error interrupts RIS.PERIS, RIS.BERIS, RIS.FERIS or RIS.OERIS are asserted).
1TXDMAER/W0hTransmit DMA enable. If this bit is set to 1, DMA for the transmit FIFO is enabled.
0RXDMAER/W0hReceive DMA enable. If this bit is set to 1, DMA for the receive FIFO is enabled.