SLAU847D October   2022  – May 2024 MSPM0L1105 , MSPM0L1106 , MSPM0L1227 , MSPM0L1228 , MSPM0L1228-Q1 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346 , MSPM0L2227 , MSPM0L2228 , MSPM0L2228-Q1

 

  1.   1
  2.   Read This First
    1.     About This Manual
    2.     Notational Conventions
    3.     Glossary
    4.     Related Documentation
    5.     Support Resources
    6.     Trademarks
  3. 1 Architecture
    1. 1.1 Architecture Overview
    2. 1.2 Bus Organization
    3. 1.3 Platform Memory Map
      1. 1.3.1 Code Region
      2. 1.3.2 SRAM Region
      3. 1.3.3 Peripheral Region
      4. 1.3.4 Subsystem Region
      5. 1.3.5 System PPB Region
    4. 1.4 Boot Configuration
      1. 1.4.1 Configuration Memory (NONMAIN)
        1. 1.4.1.1 CRC-Backed Configuration Data
        2. 1.4.1.2 16-bit Pattern Match for Critical Fields
      2. 1.4.2 Boot Configuration Routine (BCR)
        1. 1.4.2.1 Serial Wire Debug Related Policies
          1. 1.4.2.1.1 SWD Security Level 0
          2. 1.4.2.1.2 SWD Security Level 1
          3. 1.4.2.1.3 SWD Security Level 2
        2. 1.4.2.2 SWD Mass Erase and Factory Reset Commands
        3. 1.4.2.3 Flash Memory Protection and Integrity Related Policies
          1. 1.4.2.3.1 Locking the Application (MAIN) Flash Memory
          2. 1.4.2.3.2 Locking the Configuration (NONMAIN) Flash Memory
          3. 1.4.2.3.3 Static Write Protection NONMAIN Fields
        4. 1.4.2.4 Application CRC Verification
        5. 1.4.2.5 Fast Boot
        6. 1.4.2.6 Bootstrap Loader (BSL) Enable/Disable Policy
          1. 1.4.2.6.1 BSL Enable
      3. 1.4.3 Bootstrap Loader (BSL)
        1. 1.4.3.1 GPIO Invoke
        2. 1.4.3.2 Bootstrap Loader (BSL) Security Policies
          1. 1.4.3.2.1 BSL Access Password
          2. 1.4.3.2.2 BSL Read-out Policy
          3. 1.4.3.2.3 BSL Security Alert Policy
        3. 1.4.3.3 Application Version
        4. 1.4.3.4 BSL Triggered Mass Erase and Factory Reset
    5. 1.5 NONMAIN_L1105_L1106_L1303_L1304_L1305_L1306_L1343_L1344_L1345_L1346 Registers
    6. 1.6 NONMAIN_L1227_L1228_L2227_L2228 Registers
    7. 1.7 Factory Constants
      1. 1.7.1 FACTORYREGION Registers
  4. 2 PMCU
    1. 2.1 PMCU Overview
      1. 2.1.1 Power Domains
      2. 2.1.2 Operating Modes
        1. 2.1.2.1 RUN Mode
        2. 2.1.2.2 SLEEP Mode
        3. 2.1.2.3 STOP Mode
        4. 2.1.2.4 STANDBY Mode
        5. 2.1.2.5 SHUTDOWN Mode
        6. 2.1.2.6 Supported Functionality by Operating Mode
        7. 2.1.2.7 Suspended Low-Power Mode Operation
    2. 2.2 Power Management (PMU)
      1. 2.2.1 Power Supply
      2. 2.2.2 Core Regulator
      3. 2.2.3 Supply Supervisors
        1. 2.2.3.1 Power-on Reset (POR) Supervisor
        2. 2.2.3.2 Brownout Reset (BOR) Supervisor
        3. 2.2.3.3 POR and BOR Behavior During Supply Changes
      4. 2.2.4 Bandgap Reference
      5. 2.2.5 Temperature Sensor
      6. 2.2.6 VBOOST for Analog Muxes
      7. 2.2.7 Peripheral Power Enable Control
        1. 2.2.7.1 Automatic Peripheral Disable in Low Power Modes
    3. 2.3 Clock Module (CKM)
      1. 2.3.1 Oscillators
        1. 2.3.1.1 Internal Low-Frequency Oscillator (LFOSC)
        2. 2.3.1.2 Internal System Oscillator (SYSOSC)
          1. 2.3.1.2.1 SYSOSC Gear Shift
          2. 2.3.1.2.2 SYSOSC Frequency and User Trims
          3. 2.3.1.2.3 SYSOSC Frequency Correction Loop
            1. 2.3.1.2.3.1 SYSOSC FCL in External Resistor Mode (ROSC)
            2. 2.3.1.2.3.2 SYSOSC FCL in Internal Resistor Mode
          4. 2.3.1.2.4 SYSOSC User Trim Procedure
          5. 2.3.1.2.5 Disabling SYSOSC
        3. 2.3.1.3 Low Frequency Crystal Oscillator (LFXT)
        4. 2.3.1.4 LFCLK_IN (Digital Clock)
        5. 2.3.1.5 High Frequency Crystal Oscillator (HFXT)
        6. 2.3.1.6 HFCLK_IN (Digital clock)
      2. 2.3.2 Clocks
        1. 2.3.2.1  MCLK (Main Clock) Tree
        2. 2.3.2.2  CPUCLK (Processor Clock)
        3. 2.3.2.3  ULPCLK (Low-Power Clock)
        4. 2.3.2.4  MFCLK (Middle Frequency Clock)
        5. 2.3.2.5  MFPCLK (Middle Frequency Precision Clock)
        6. 2.3.2.6  LFCLK (Low-Frequency Clock)
        7. 2.3.2.7  HFCLK (High-Frequency External Clock)
        8. 2.3.2.8  HSCLK (High Speed Clock)
        9. 2.3.2.9  ADCCLK (ADC Sample Period Clock)
        10. 2.3.2.10 RTCCLK (RTC Clock)
        11. 2.3.2.11 External Clock Output (CLK_OUT)
        12. 2.3.2.12 Direct Clock Connections for Infrastructure
      3. 2.3.3 Clock Tree
        1. 2.3.3.1 Peripheral Clock Source Selection
      4. 2.3.4 Clock Monitors
        1. 2.3.4.1 LFCLK Monitor
        2. 2.3.4.2 MCLK Monitor
        3. 2.3.4.3 Startup Monitors
          1. 2.3.4.3.1 LFOSC Startup Monitor
          2. 2.3.4.3.2 LFXT Startup Monitor
          3. 2.3.4.3.3 HFCLK Startup Monitor
          4. 2.3.4.3.4 HSCLK Status
      5. 2.3.5 Frequency Clock Counter (FCC)
        1. 2.3.5.1 Using the FCC
        2. 2.3.5.2 FCC Frequency Computation and Accuracy
    4. 2.4 System Controller (SYSCTL)
      1. 2.4.1  Resets and Device Initialization
        1. 2.4.1.1 Reset Levels
          1. 2.4.1.1.1 Power-on Reset (POR) Reset Level
          2. 2.4.1.1.2 Brownout Reset (BOR) Reset Level
          3. 2.4.1.1.3 Boot Reset (BOOTRST) Reset Level
          4. 2.4.1.1.4 System Reset (SYSRST) Reset Level
          5. 2.4.1.1.5 CPU-only Reset (CPURST) Reset Level
        2. 2.4.1.2 Initial Conditions After POR
        3. 2.4.1.3 NRST Pin
        4. 2.4.1.4 SWD Pins
        5. 2.4.1.5 Generating Resets in Software
        6. 2.4.1.6 Reset Cause
        7. 2.4.1.7 Peripheral Reset Control
        8. 2.4.1.8 Boot Fail Handling
      2. 2.4.2  Operating Mode Selection
      3. 2.4.3  Asynchronous Fast Clock Requests
      4. 2.4.4  SRAM Write Protection
      5. 2.4.5  Flash Wait States
      6. 2.4.6  Flash Bank Address Swap
      7. 2.4.7  Shutdown Mode Handling
      8. 2.4.8  Configuration Lockout
      9. 2.4.9  System Status
      10. 2.4.10 Error Handling
      11. 2.4.11 SYSCTL Events
        1. 2.4.11.1 CPU Interrupt Event (CPU_INT)
        2. 2.4.11.2 Nonmaskable Interrupt Event (NMI)
    5. 2.5 Quick Start Reference
      1. 2.5.1 Default Device Configuration
      2. 2.5.2 Leveraging MFCLK
      3. 2.5.3 Optimizing Power Consumption in STOP Mode
      4. 2.5.4 Optimizing Power Consumption in STANDBY Mode
      5. 2.5.5 Increasing MCLK and ULPCLK Precision
      6. 2.5.6 High Speed Clock (SYSPLL, HFCLK) Handling in Low-Power Modes
      7. 2.5.7 Optimizing for Lowest Wakeup Latency
      8. 2.5.8 Optimizing for Lowest Peak Current in RUN/SLEEP Mode
    6. 2.6 SYSCTL_L1105_L1106_L1303_L1304_L1305_L1306_L1343_L1344_L1345_L1346 Registers
    7. 2.7 SYSCTL_L1227_L1228_L2227_L2228 Registers
  5. 3 CPU
    1. 3.1 Overview
    2. 3.2 Arm Cortex-M0+ CPU
      1. 3.2.1 CPU Register File
      2. 3.2.2 Stack Behavior
      3. 3.2.3 Execution Modes and Privilege Levels
      4. 3.2.4 Address Space and Supported Data Sizes
    3. 3.3 Interrupts and Exceptions
      1. 3.3.1 Peripheral Interrupts (IRQs)
        1. 3.3.1.1 Nested Vectored Interrupt Controller (NVIC)
        2. 3.3.1.2 Interrupt Groups
        3. 3.3.1.3 Wake Up Controller (WUC)
      2. 3.3.2 Interrupt and Exception Table
      3. 3.3.3 Processor Lockup Scenario
    4. 3.4 CPU Peripherals
      1. 3.4.1 System Control Block (SCB)
      2. 3.4.2 System Tick Timer (SysTick)
    5. 3.5 Read-Only Memory (ROM)
    6. 3.6 CPUSS Registers
    7. 3.7 WUC Registers
  6. 4 SECURITY
    1. 4.1 Overview
      1. 4.1.1 Secure Boot
      2. 4.1.2 Customer Secure Code (CSC)
    2. 4.2 Boot and Startup Sequence
      1. 4.2.1 CSC Programming Overview
    3. 4.3 Secure Key Storage
    4. 4.4 Flash Memory Protection
      1. 4.4.1 Bank Swapping
      2. 4.4.2 Write Protection
      3. 4.4.3 Read-Execute Protection
      4. 4.4.4 IP Protection
      5. 4.4.5 Data Bank Protection
      6. 4.4.6 Hardware Monotonic Counter
    5. 4.5 SRAM Protection
    6. 4.6 SECURITY Registers
  7. 5 DMA
    1. 5.1 DMA Overview
    2. 5.2 DMA Operation
      1. 5.2.1  Addressing Modes
      2. 5.2.2  Channel Types
      3. 5.2.3  Transfer Modes
        1. 5.2.3.1 Single Transfer
        2. 5.2.3.2 Block Transfer
        3. 5.2.3.3 Repeated Single Transfer
        4. 5.2.3.4 Repeated Block Transfer
        5. 5.2.3.5 Stride Mode
      4. 5.2.4  Extended Modes
        1. 5.2.4.1 Fill Mode
        2. 5.2.4.2 Table Mode
      5. 5.2.5  Initiating DMA Transfers
      6. 5.2.6  Stopping DMA Transfers
      7. 5.2.7  Channel Priorities
      8. 5.2.8  Burst Block Mode
      9. 5.2.9  Using DMA with System Interrupts
      10. 5.2.10 DMA Controller Interrupts
      11. 5.2.11 DMA Trigger Event Status
      12. 5.2.12 DMA Operating Mode Support
        1. 5.2.12.1 Transfer in RUN Mode
        2. 5.2.12.2 Transfer in SLEEP Mode
        3. 5.2.12.3 Transfer in STOP Mode
        4. 5.2.12.4 Transfers in STANDBY Mode
      13. 5.2.13 DMA Address and Data Errors
      14. 5.2.14 Interrupt and Event Support
    3. 5.3 DMA Registers
  8. 6 NVM (Flash)
    1. 6.1 NVM Overview
      1. 6.1.1 Key Features
      2. 6.1.2 System Components
      3. 6.1.3 Terminology
    2. 6.2 Flash Memory Bank Organization
      1. 6.2.1 Banks
      2. 6.2.2 Flash Memory Regions
      3. 6.2.3 Addressing
        1. 6.2.3.1 Flash Memory Map
      4. 6.2.4 Memory Organization Examples
    3. 6.3 Flash Controller
      1. 6.3.1 Overview of Flash Controller Commands
      2. 6.3.2 NOOP Command
      3. 6.3.3 PROGRAM Command
        1. 6.3.3.1 Program Bit Masking Behavior
        2. 6.3.3.2 Programming Less Than One Flash Word
        3. 6.3.3.3 Target Data Alignment (Devices with Single Flash Word Programming Only)
        4. 6.3.3.4 Target Data Alignment (Devices With Multiword Programming)
        5. 6.3.3.5 Executing a PROGRAM Operation
      4. 6.3.4 ERASE Command
        1. 6.3.4.1 Erase Sector Masking Behavior
        2. 6.3.4.2 Executing an ERASE Operation
      5. 6.3.5 READVERIFY Command
        1. 6.3.5.1 Executing a READVERIFY Operation
      6. 6.3.6 BLANKVERIFY Command
        1. 6.3.6.1 Executing a BLANKVERIFY Operation
      7. 6.3.7 Command Diagnostics
        1. 6.3.7.1 Command Status
        2. 6.3.7.2 Address Translation
        3. 6.3.7.3 Pulse Counts
      8. 6.3.8 Overriding the System Address With a Bank ID, Region ID, and Bank Address
      9. 6.3.9 FLASHCTL Events
        1. 6.3.9.1 CPU Interrupt Event Publisher
    4. 6.4 Write Protection
      1. 6.4.1 Write Protection Resolution
      2. 6.4.2 Static Write Protection
      3. 6.4.3 Dynamic Write Protection
        1. 6.4.3.1 Configuring Protection for the MAIN Region
        2. 6.4.3.2 Configuring Protection for the NONMAIN Region
    5. 6.5 Read Interface
      1. 6.5.1 Bank Address Swapping
    6. 6.6 FLASHCTL Registers
  9. 7 Events
    1. 7.1 Events Overview
      1. 7.1.1 Event Publisher
      2. 7.1.2 Event Subscriber
      3. 7.1.3 Event Fabric Routing
        1. 7.1.3.1 CPU Interrupt Event Route (CPU_INT)
        2. 7.1.3.2 DMA Trigger Event Route (DMA_TRIGx)
        3. 7.1.3.3 Generic Event Route (GEN_EVENTx)
      4. 7.1.4 Event Routing Map
      5. 7.1.5 Event Propagation Latency
    2. 7.2 Events Operation
      1. 7.2.1 CPU Interrupt
      2. 7.2.2 DMA Trigger
      3. 7.2.3 Peripheral to Peripheral Event
      4. 7.2.4 Extended Module Description Register
      5. 7.2.5 Using Event Registers
        1. 7.2.5.1 Event Registers
        2. 7.2.5.2 Configuring Events
        3. 7.2.5.3 Responding to CPU Interrupts in Application Software
        4. 7.2.5.4 Hardware Event Handling
  10. 8 Low Frequency Subsystem (LFSS)
    1. 8.1  Overview
    2. 8.2  Clock System
    3. 8.3  LFSS Reset Using VBAT
    4. 8.4  Power Domains and Supply Detection
      1. 8.4.1 Startup When VBAT Powers on First
      2. 8.4.2 Startup when VDD powers on first
      3. 8.4.3 Behavior When VDD is Lost
      4. 8.4.4 Behavior when VBAT is lost
      5. 8.4.5 Behavior when the device goes into SHUTDOWN mode
      6. 8.4.6 Supercapacitor Charging Circuit
    5. 8.5  Real Time Counter (RTC_x)
    6. 8.6  Independent Watchdog Timer (IWDT)
    7. 8.7  Tamper Input and Output
      1. 8.7.1 IOMUX Mode
      2. 8.7.2 Tamper Mode
        1. 8.7.2.1 Tamper Event Detection
        2. 8.7.2.2 Timestamp Event Output
        3. 8.7.2.3 Heartbeat Generator
        4. 8.7.2.4 RTC Clock Output
    8. 8.8  Scratchpad Memory
    9. 8.9  Lock Function of RTC, TIO, and WDT
    10. 8.10 LFSS Registers
  11. 9 IOMUX
    1. 9.1 IOMUX Overview
      1. 9.1.1 IO Types and Analog Sharing
    2. 9.2 IOMUX Operation
      1. 9.2.1 Peripheral Function (PF) Assignment
      2. 9.2.2 Logic High to Hi-Z Conversion
      3. 9.2.3 Logic Inversion
      4. 9.2.4 SHUTDOWN Mode Wakeup Logic
      5. 9.2.5 Pullup/Pulldown Resistors
      6. 9.2.6 Drive Strength Control
      7. 9.2.7 Hysteresis and Logic Level Control
    3. 9.3 IOMUX (PINCMx) Register Format
    4. 9.4 IOMUX Registers
  12. 10TRNG
    1. 10.1 TRNG Overview
    2. 10.2 TRNG Operation
      1. 10.2.1 TRNG Generation Data Path
      2. 10.2.2 Clock Configuration and Output Rate
      3. 10.2.3 Behavior in Low Power Modes
      4. 10.2.4 Health Tests
        1. 10.2.4.1 Digital Block Startup Self-Test
        2. 10.2.4.2 Analog Block Startup Self-Test
        3. 10.2.4.3 Runtime Health Test
          1. 10.2.4.3.1 Repetition Count Test
          2. 10.2.4.3.2 Adaptive Proportion Test
          3. 10.2.4.3.3 Handling Runtime Health Test Failures
      5. 10.2.5 Configuration
        1. 10.2.5.1 TRNG State Machine
          1. 10.2.5.1.1 Changing TRNG States
        2. 10.2.5.2 Using the TRNG
        3. 10.2.5.3 TRNG Events
          1. 10.2.5.3.1 CPU Interrupt Event Publisher (CPU_INT)
    3. 10.3 TRNG Registers
  13. 11AESADV
    1. 11.1 AESADV Overview
      1. 11.1.1 AESADV Performance
    2. 11.2 AESADV Operation
      1. 11.2.1 Loading the Key
      2. 11.2.2 Writing Input Data
      3. 11.2.3 Reading Output Data
      4. 11.2.4 Operation Descriptions
        1. 11.2.4.1 Single Block Operation
        2. 11.2.4.2 Electronic Codebook (ECB) Mode
          1. 11.2.4.2.1 ECB Encryption
          2. 11.2.4.2.2 ECB Decryption
        3. 11.2.4.3 Cipher Block Chaining (CBC) Mode
          1. 11.2.4.3.1 CBC Encryption
          2. 11.2.4.3.2 CBC Decryption
        4. 11.2.4.4 Output Feedback (OFB) Mode
          1. 11.2.4.4.1 OFB Encryption
          2. 11.2.4.4.2 OFB Decryption
        5. 11.2.4.5 Cipher Feedback (CFB) Mode
          1. 11.2.4.5.1 CFB Encryption
          2. 11.2.4.5.2 CFB Decryption
        6. 11.2.4.6 Counter (CTR) Mode
          1. 11.2.4.6.1 CTR Encryption
          2. 11.2.4.6.2 CTR Decryption
        7. 11.2.4.7 Galois Counter (GCM) Mode
          1. 11.2.4.7.1 GHASH Operation
          2. 11.2.4.7.2 GCM Operating Modes
            1. 11.2.4.7.2.1 Autonomous GCM Operation
              1. 11.2.4.7.2.1.1 GMAC
            2. 11.2.4.7.2.2 GCM With Pre-Calculations
            3. 11.2.4.7.2.3 GCM Operation With Precalculated H- and Y0-Encrypted Forced to Zero
        8. 11.2.4.8 Counter With Cipher Block Chaining Message Authentication Code (CCM)
          1. 11.2.4.8.1 CCM Operation
      5. 11.2.5 AES Events
        1. 11.2.5.1 CPU Interrupt Event Publisher (CPU_EVENT)
        2. 11.2.5.2 DMA Trigger Event Publisher (DMA_TRIG_DATAIN)
        3. 11.2.5.3 DMA Trigger Event Publisher (DMA_TRIG_DATAOUT)
    3. 11.3 AESADV Registers
  14. 12Keystore
    1. 12.1 Overview
    2. 12.2 Detailed Description
    3. 12.3 KEYSTORECTL Registers
  15. 13GPIO
    1. 13.1 GPIO Overview
    2. 13.2 GPIO Operation
      1. 13.2.1 GPIO Ports
      2. 13.2.2 GPIO Read/Write Interface
      3. 13.2.3 GPIO Input Glitch Filtering and Synchronization
      4. 13.2.4 GPIO Fast Wake
      5. 13.2.5 GPIO DMA Interface
      6. 13.2.6 Event Publishers and Subscribers
    3. 13.3 GPIO Registers
  16. 14ADC
    1. 14.1 ADC Overview
    2. 14.2 ADC Operation
      1. 14.2.1  ADC Core
      2. 14.2.2  Voltage Reference Options
      3. 14.2.3  Generic Resolution Modes
      4. 14.2.4  Hardware Averaging
      5. 14.2.5  ADC Clocking
      6. 14.2.6  Common ADC Use Cases
      7. 14.2.7  Power Down Behavior
      8. 14.2.8  Sampling Trigger Sources and Sampling Modes
        1. 14.2.8.1 AUTO Sampling Mode
        2. 14.2.8.2 MANUAL Sampling Mode
      9. 14.2.9  Sampling Period
      10. 14.2.10 Conversion Modes
      11. 14.2.11 Data Format
      12. 14.2.12 Advanced Features
        1. 14.2.12.1 Window Comparator
        2. 14.2.12.2 DMA and FIFO Operation
        3. 14.2.12.3 Analog Peripheral Interconnection
      13. 14.2.13 Status Register
      14. 14.2.14 ADC Events
        1. 14.2.14.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 14.2.14.2 Generic Event Publisher (GEN_EVENT)
        3. 14.2.14.3 DMA Trigger Event Publisher (DMA_TRIG)
        4. 14.2.14.4 Generic Event Subscriber (FSUB_0)
    3. 14.3 ADC12 Registers
  17. 15COMP
    1. 15.1 Comparator Overview
    2. 15.2 Comparator Operation
      1. 15.2.1  Comparator Configuration
      2. 15.2.2  Comparator Channels Selection
      3. 15.2.3  Comparator Output
      4. 15.2.4  Output Filter
      5. 15.2.5  Sampled Output Mode
      6. 15.2.6  Blanking Mode
      7. 15.2.7  Reference Voltage Generator
      8. 15.2.8  Comparator Hysteresis
      9. 15.2.9  Input SHORT Switch
      10. 15.2.10 Interrupt and Events Support
        1. 15.2.10.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 15.2.10.2 Generic Event Publisher (GEN_EVENT)
        3. 15.2.10.3 Generic Event Subscribers
    3. 15.3 COMP Registers
  18. 16OPA
    1. 16.1 OPA Overview
    2. 16.2 OPA Operation
      1. 16.2.1 Analog Core
      2. 16.2.2 Power Up Behavior
      3. 16.2.3 Inputs
      4. 16.2.4 Output
      5. 16.2.5 Clock Requirements
      6. 16.2.6 Chopping
      7. 16.2.7 OPA Amplifier Modes
        1. 16.2.7.1 General-Purpose Mode
        2. 16.2.7.2 Buffer Mode
        3. 16.2.7.3 OPA PGA Mode
          1. 16.2.7.3.1 Inverting PGA Mode
          2. 16.2.7.3.2 Non-inverting PGA Mode
        4. 16.2.7.4 Difference Amplifier Mode
        5. 16.2.7.5 Cascade Amplifier Mode
      8. 16.2.8 OPA Configuration Selection
      9. 16.2.9 Burnout Current Source
    3. 16.3 OA Registers
  19. 17GPAMP
    1. 17.1 GPAMP Overview
    2. 17.2 GPAMP Operation
      1. 17.2.1 Analog Core
      2. 17.2.2 Power Up Behavior
      3. 17.2.3 Inputs
      4. 17.2.4 Output
      5. 17.2.5 GPAMP Amplifier Modes
        1. 17.2.5.1 General-Purpose Mode
        2. 17.2.5.2 ADC Buffer Mode
        3. 17.2.5.3 Unity Gain Mode
      6. 17.2.6 Chopping
    3. 17.3 GPAMP Registers
  20. 18VREF
    1. 18.1 VREF Overview
    2. 18.2 VREF Operation
      1. 18.2.1 Internal Reference Generation
      2. 18.2.2 External Reference Input
      3. 18.2.3 Analog Peripheral Interface
    3. 18.3 VREF Registers
  21. 19UART
    1. 19.1 UART Overview
      1. 19.1.1 Purpose of the Peripheral
      2. 19.1.2 Features
      3. 19.1.3 Functional Block Diagram
    2. 19.2 UART Operation
      1. 19.2.1 Clock Control
      2. 19.2.2 Signal Descriptions
      3. 19.2.3 General Architecture and Protocol
        1. 19.2.3.1  Transmit Receive Logic
        2. 19.2.3.2  Bit Sampling
        3. 19.2.3.3  Majority Voting Feature
        4. 19.2.3.4  Baud Rate Generation
        5. 19.2.3.5  Data Transmission
        6. 19.2.3.6  Error and Status
        7. 19.2.3.7  Local Interconnect Network (LIN) Support
          1. 19.2.3.7.1 LIN Responder Transmission Delay
        8. 19.2.3.8  Flow Control
        9. 19.2.3.9  Idle-Line Multiprocessor
        10. 19.2.3.10 9-Bit UART Mode
        11. 19.2.3.11 RS485 Support
        12. 19.2.3.12 DALI Protocol
        13. 19.2.3.13 Manchester Encoding and Decoding
        14. 19.2.3.14 IrDA Encoding and Decoding
        15. 19.2.3.15 ISO7816 Smart Card Support
        16. 19.2.3.16 Address Detection
        17. 19.2.3.17 FIFO Operation
        18. 19.2.3.18 Loopback Operation
        19. 19.2.3.19 Glitch Suppression
      4. 19.2.4 Low Power Operation
      5. 19.2.5 Reset Considerations
      6. 19.2.6 Initialization
      7. 19.2.7 Interrupt and Events Support
        1. 19.2.7.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 19.2.7.2 DMA Trigger Publisher (DMA_TRIG_RX, DMA_TRIG_TX)
      8. 19.2.8 Emulation Modes
    3. 19.3 UART Registers
  22. 20SPI
    1. 20.1 SPI Overview
      1. 20.1.1 Purpose of the Peripheral
      2. 20.1.2 Features
      3. 20.1.3 Functional Block Diagram
      4. 20.1.4 External Connections and Signal Descriptions
    2. 20.2 SPI Operation
      1. 20.2.1 Clock Control
      2. 20.2.2 General Architecture
        1. 20.2.2.1 Chip Select and Command Handling
          1. 20.2.2.1.1 Chip Select Control
          2. 20.2.2.1.2 Command Data Control
        2. 20.2.2.2 Data Format
        3. 20.2.2.3 Delayed data sampling
        4. 20.2.2.4 Clock Generation
        5. 20.2.2.5 FIFO Operation
        6. 20.2.2.6 Loopback mode
        7. 20.2.2.7 DMA Operation
        8. 20.2.2.8 Repeat Transfer mode
        9. 20.2.2.9 Low Power Mode
      3. 20.2.3 Protocol Descriptions
        1. 20.2.3.1 Motorola SPI Frame Format
        2. 20.2.3.2 Texas Instruments Synchronous Serial Frame Format
      4. 20.2.4 Reset Considerations
      5. 20.2.5 Initialization
      6. 20.2.6 Interrupt and Events Support
        1. 20.2.6.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 20.2.6.2 DMA Trigger Publisher (DMA_TRIG_RX, DMA_TRIG_TX)
      7. 20.2.7 Emulation Modes
    3. 20.3 SPI Registers
  23. 21I2C
    1. 21.1 I2C Overview
      1. 21.1.1 Purpose of the Peripheral
      2. 21.1.2 Features
      3. 21.1.3 Functional Block Diagram
      4. 21.1.4 Environment and External Connections
    2. 21.2 I2C Operation
      1. 21.2.1 Clock Control
        1. 21.2.1.1 Clock Select and I2C Speed
        2. 21.2.1.2 Clock Startup
      2. 21.2.2 Signal Descriptions
      3. 21.2.3 General Architecture
        1. 21.2.3.1  I2C Bus Functional Overview
        2. 21.2.3.2  START and STOP Conditions
        3. 21.2.3.3  Data Format with 7-Bit Address
        4. 21.2.3.4  Acknowledge
        5. 21.2.3.5  Repeated Start
        6. 21.2.3.6  SCL Clock Low Timeout
        7. 21.2.3.7  Clock Stretching
        8. 21.2.3.8  Dual Address
        9. 21.2.3.9  Arbitration
        10. 21.2.3.10 Multiple Controller Mode
        11. 21.2.3.11 Glitch Suppression
        12. 21.2.3.12 FIFO operation
          1. 21.2.3.12.1 Flushing Stale Tx Data in Target Mode
        13. 21.2.3.13 Loopback mode
        14. 21.2.3.14 Burst Mode
        15. 21.2.3.15 DMA Operation
        16. 21.2.3.16 Low-Power Operation
      4. 21.2.4 Protocol Descriptions
        1. 21.2.4.1 I2C Controller Mode
          1. 21.2.4.1.1 Controller Configuration
          2. 21.2.4.1.2 Controller Mode Operation
          3. 21.2.4.1.3 Read On TX Empty
        2. 21.2.4.2 I2C Target Mode
          1. 21.2.4.2.1 Target Mode Operation
      5. 21.2.5 Reset Considerations
      6. 21.2.6 Initialization
      7. 21.2.7 Interrupt and Events Support
        1. 21.2.7.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 21.2.7.2 DMA Trigger Publisher (DMA_TRIG1, DMA_TRIG0)
      8. 21.2.8 Emulation Modes
    3. 21.3 I2C Registers
  24. 22CRC
    1. 22.1 CRC Overview
      1. 22.1.1 CRC16-CCITT
      2. 22.1.2 CRC32-ISO3309
    2. 22.2 CRC Operation
      1. 22.2.1 CRC Generator Implementation
      2. 22.2.2 Configuration
        1. 22.2.2.1 Polynomial Selection
        2. 22.2.2.2 Bit Order
        3. 22.2.2.3 Byte Swap
        4. 22.2.2.4 Byte Order
        5. 22.2.2.5 CRC C Library Compatibility
    3. 22.3 CRC Registers
  25. 23Timers (TIMx)
    1. 23.1 TIMx Overview
      1. 23.1.1 TIMG Overview
        1. 23.1.1.1 TIMG Features
        2. 23.1.1.2 Functional Block Diagram
      2. 23.1.2 TIMA Overview
        1. 23.1.2.1 TIMA Features
        2. 23.1.2.2 Functional Block Diagram
      3. 23.1.3 TIMx Instance Configuration
    2. 23.2 TIMx Operation
      1. 23.2.1  Timer Counter
        1. 23.2.1.1 Clock Source Select and Prescaler
          1. 23.2.1.1.1 Internal Clock and Prescaler
          2. 23.2.1.1.2 External Signal Trigger
        2. 23.2.1.2 Repeat Counter (TIMA only)
      2. 23.2.2  Counting Mode Control
        1. 23.2.2.1 One-shot and Periodic Modes
        2. 23.2.2.2 Down Counting Mode
        3. 23.2.2.3 Up/Down Counting Mode
        4. 23.2.2.4 Up Counting Mode
        5. 23.2.2.5 Phase Load (TIMA only)
      3. 23.2.3  Capture/Compare Module
        1. 23.2.3.1 Capture Mode
          1. 23.2.3.1.1 Input Selection, Counter Conditions, and Inversion
            1. 23.2.3.1.1.1 CCP Input Edge Synchronization
            2. 23.2.3.1.1.2 CCP Input Pulse Conditions
            3. 23.2.3.1.1.3 Counter Control Operation
            4. 23.2.3.1.1.4 CCP Input Filtering
            5. 23.2.3.1.1.5 Input Selection
          2. 23.2.3.1.2 Use Cases
            1. 23.2.3.1.2.1 Edge Time Capture
            2. 23.2.3.1.2.2 Period Capture
            3. 23.2.3.1.2.3 Pulse Width Capture
            4. 23.2.3.1.2.4 Combined Pulse Width and Period Time
          3. 23.2.3.1.3 QEI Mode (TIMG with QEI support only)
            1. 23.2.3.1.3.1 QEI With 2-Signal
            2. 23.2.3.1.3.2 QEI With Index Input
            3. 23.2.3.1.3.3 QEI Error Detection
          4. 23.2.3.1.4 Hall Input Mode (TIMG with QEI support only)
        2. 23.2.3.2 Compare Mode
          1. 23.2.3.2.1 Edge Count
      4. 23.2.4  Shadow Load and Shadow Compare
        1. 23.2.4.1 Shadow Load (TIMG4-7, TIMA only)
        2. 23.2.4.2 Shadow Compare (TIMG4-7, TIMG12-13, TIMA only)
      5. 23.2.5  Output Generator
        1. 23.2.5.1 Configuration
        2. 23.2.5.2 Use Cases
          1. 23.2.5.2.1 Edge-Aligned PWM
          2. 23.2.5.2.2 Center-Aligned PWM
          3. 23.2.5.2.3 Asymmetric PWM (TIMA only)
          4. 23.2.5.2.4 Complementary PWM With Deadband Insertion (TIMA only)
        3. 23.2.5.3 Forced Output
      6. 23.2.6  Fault Handler (TIMA only)
        1. 23.2.6.1 Fault Input Conditioning
        2. 23.2.6.2 Fault Input Sources
        3. 23.2.6.3 Counter Behavior With Fault Conditions
        4. 23.2.6.4 Output Behavior With Fault Conditions
      7. 23.2.7  Synchronization With Cross Trigger
        1. 23.2.7.1 Main Timer Cross Trigger Configuration
        2. 23.2.7.2 Secondary Timer Cross Trigger Configuration
      8. 23.2.8  Low Power Operation
      9. 23.2.9  Interrupt and Event Support
        1. 23.2.9.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 23.2.9.2 Generic Event Publisher and Subscriber (GEN_EVENT0 and GEN_EVENT1)
        3. 23.2.9.3 Generic Subscriber Event Example (COMP to TIMx)
      10. 23.2.10 Debug Handler (TIMA Only)
    3. 23.3 TIMx Registers
  26. 24LCD
    1. 24.1 LCD Introduction
      1. 24.1.1 LCD Operating Principle
      2. 24.1.2 LCD Mux Modes
      3. 24.1.3 Introduction
      4. 24.1.4 LCD Waveforms
    2. 24.2 LCD Clocking
    3. 24.3 Voltage Generation
      1. 24.3.1  Mode 0 - Voltage Generation from external reference and external resistor divider
      2. 24.3.2  Mode 1 - Voltage Generation from AVDD and external resistor divider
      3. 24.3.3  Mode 2 - Voltage Generation from external reference and internal resistor divider
      4. 24.3.4  Mode 3 - Voltage Generation From AVDD and Internal Resistor Ladder
      5. 24.3.5  Mode 4 - Voltage Generation from charge pump with external supply
      6. 24.3.6  Mode 5 - Voltage Generation From Charge Pump With AVDD
      7. 24.3.7  Mode 6 - Voltage Generation From Charge Pump With External Reference on R13
      8. 24.3.8  Mode 7 - Voltage Generation From Charge Pump With Internal Reference on R13
      9. 24.3.9  Charge pump
      10. 24.3.10 Internal Reference Generation
    4. 24.4 Analog Mux
      1. 24.4.1 Static Mode
      2. 24.4.2 Non-Static 1/3 bias mode
      3. 24.4.3 Non-Static 1/4 bias mode
      4. 24.4.4 Low power mode switch controls
    5. 24.5 LCD Memory and output drive
      1. 24.5.1 LCD Memory organization
        1. 24.5.1.1 Memory Organization in Mux-1 to Mux-4 Modes
        2. 24.5.1.2 Memory Organization in Mux-5 to Mux-8 Modes
        3. 24.5.1.3 Configuring memory
        4. 24.5.1.4 Accessing memory and output drive
        5. 24.5.1.5 Blinking Override
    6. 24.6 IO Muxing
    7. 24.7 Interrupt Generation
    8. 24.8 Power Domains and Power Modes
    9. 24.9 LCD Registers
  27. 25RTC
    1. 25.1 Overview
      1. 25.1.1 RTC Instances
    2. 25.2 Basic Operation
    3. 25.3 Configuration
      1. 25.3.1  Clocking
      2. 25.3.2  Reading and Writing to RTC Peripheral Registers
      3. 25.3.3  Binary vs. BCD
      4. 25.3.4  Leap Year Handling
      5. 25.3.5  Calendar Alarm Configuration
      6. 25.3.6  Interval Alarm Configuration
      7. 25.3.7  Periodic Alarm Configuration
      8. 25.3.8  Calibration
        1. 25.3.8.1 Crystal Offset Error
          1. 25.3.8.1.1 Offset Error Correction Mechanism
        2. 25.3.8.2 Crystal Temperature Error
          1. 25.3.8.2.1 Temperature Drift Correction Mechanism
      9. 25.3.9  RTC Prescaler Extension
      10. 25.3.10 RTC Timestamp Capture
      11. 25.3.11 RTC Events
        1. 25.3.11.1 CPU Interrupt Event Publisher (CPU_INT)
        2. 25.3.11.2 Generic Event Publisher (GEN_EVENT)
    4. 25.4 RTC Registers
  28. 26IWDT
    1. 26.1 IWDT Initialization after LFSS Reset
    2. 26.2 IWDT Clock Configuration
    3. 26.3 IWDT Period Selection
    4. 26.4 Debug Behavior of the IWDT
    5. 26.5 IWDT Registers
  29. 27WWDT
    1. 27.1 WWDT Overview
      1. 27.1.1 Watchdog Mode
      2. 27.1.2 Interval Timer Mode
    2. 27.2 WWDT Operation
      1. 27.2.1 Mode Selection
      2. 27.2.2 Clock Configuration
      3. 27.2.3 Low-Power Mode Behavior
      4. 27.2.4 Debug Behavior
      5. 27.2.5 WWDT Events
        1. 27.2.5.1 CPU Interrupt Event Publisher (CPU_INT)
    3. 27.3 WWDT Registers
  30. 28Debug
    1. 28.1 Overview
      1. 28.1.1 Debug Interconnect
      2. 28.1.2 Physical Interface
      3. 28.1.3 Debug Access Ports
    2. 28.2 Debug Features
      1. 28.2.1 Processor Debug
        1. 28.2.1.1 Breakpoint Unit (BPU)
        2. 28.2.1.2 Data Watchpoint and Trace Unit (DWT)
      2. 28.2.2 Peripheral Debug
      3. 28.2.3 EnergyTrace Technology
    3. 28.3 Behavior in Low Power Modes
    4. 28.4 Restricting Debug Access
    5. 28.5 Mailbox (DSSM)
      1. 28.5.1 DSSM Events
        1. 28.5.1.1 CPU Interrupt Event (CPU_INT)
      2. 28.5.2 DEBUGSS Registers
  31. 29Revision History

2.4.3 Asynchronous Fast Clock Requests

Peripherals are configured to asynchronously assert a hardware request to the SYSCTL for a fast clock source, even if the device is operating in STOP or STANDBY mode. This mechanism for applications where the MCLK/ULPCLK tree is normally sourced from either LFCLK (at 32kHz) or SYSOSC (at 4MHz), but a faster clock is temporarily needed to quickly handle a peripheral event (for example, a timer IRQ or GPIO IRQ) or peripheral activity (such as serial communication or an ADC conversion).

Asynchronous fast clock requests are also useful for scenarios where the device is running in STANDBY1 mode. In STANDBY1 (when STOPCLKSTBY is set), the ULPCLK and LFCLK are disabled to all peripherals except for TIMG0 and TIMG1, leaving TIMG0 and TIMG1 as the only clocked peripherals. To wake up the device from this state where the bus clock (ULPCLK) is disabled, a TIMG0 and TIMG1 interrupt request forces an asynchronous fast clock request to wake the device to RUN mode. Other peripherals can also wake the device from this state if they support detecting an asynchronous event (for example GPIO, comparator, and serial interfaces).

Asynchronous fast clock requests temporarily provide peripherals with a 32MHz bus clock ( MCLK/ULPCLK), sourced from the SYSOSC, for the duration of the request. MFCLK, if enabled for use, is also enabled during the asynchronous request.

Asynchronous Fast Clock Behavior

When configured, SYSCTL will respond to a peripheral fast clock request in the following way:

  1. If the device is currently in a STOP or STANDBY mode, the low power state is temporarily suspended to support running the bus clock (ULPCLK) at the SYSOSC base frequency (32MHz )
  2. If SYSOSC is disabled, it is forced to be enabled; if SYSOSC is already running but at a different frequency than base frequency, it is forced to base frequency (32MHz )
  3. The MCLK/ULPCLK tree is forced to be sourced from SYSOSC at the 32MHz rate; if the device is in RUN mode then the CPUCLK is also switches to the SYSOSC rate (the CPUCLK is always derived from MCLK)
  4. If the MFCLK is configured to be used, it will be activated

After the configuration above is applied, it will be held for the duration of time that the asynchronous request remains asserted plus an additional 32 SYSOSC cycles (approximately 1µs). 32 SYSOSC cycles after the request is removed, the system will return to the configuration which existed before the fast clock request, provided the CPU did not change the configuration during the request.

Asynchronous fast clock requests are ignored and will have no effect on the device configuration if any of the following are true:

  • MCLK is already sourced from SYSOSC at base frequency (32MHz )
  • Asynchronous fast clock requests are globally blocked by setting the BLOCKASYNCALL bit in the SYSOSCCFG register in SYSCTL

Peripheral Support

The TIMG0, TIMG1, GPIO, comparator, SPI, I2C, UART, and ADC peripherals all provide support for generating an asynchronous fast clock request. The purpose, request source, and configuration requirements for these peripherals are given in Table 2-11.

Table 2-11 Peripheral Support for Asynchronous Fast Clock Requests
Peripheral Purpose Request Source Configuration
TIMG0 and TIMG1 Fast CPU wake from TIMG0/TIMG1 event TIMG0 or TIMG1 IRQ to CPU An IRQ event from TIMG0 or TIMG1 generates an asynchronous fast clock request when the device is in STANDBY1 mode and the corresponding IMASK interrupt is set in the TIMG registers. This is needed to wake the device as the ULPCLK is disabled to reduce power consumption.
GPIO Fast CPU wake from GPIO event GPIO activity The GPIO generates an asynchronous fast clock request through the GPIO configuration registers. This is for applications where GPIO wake from STANDBY mode is desired, as the fast clock request will cause the GPIO digital glitch filters to run at the 32MHz rate. In addition to configuring the GPIO registers to request the fast clock, the BLOCKASYNCALL bit must be cleared in the SYSOSCCFG register to allow the request to propagate.
Comparator Fast wake from a comparator event Comparator event A comparator event generates an asynchronous fast clock request to provide the lowest latency comparator event response. The BLOCKASYNC bit in the CLKCFG register of the respective comparator must be disabled.
SPI Temporarily use fast clock for bit clock generation SPI activity SPI activity generates an asynchronous fast clock request when the BLOCKASYNC bit is cleared in the CLKCFG register of the respective SPI peripheral.
I2C Temporarily use fast clock for bit clock generation I2C activity I2C activity generates an asynchronous fast clock request when the BLOCKASYNC bit is cleared in the CLKCFG register of the respective I2C peripheral.
UART Temporarily use a fast clock for baud rate generation UART activity UART activity generates an asynchronous fast clock request when the BLOCKASYNC bit is cleared in the CLKCFG register of the respective UART peripheral.
ADC Temporarily run the SYSOSC to support timer-triggered ADC operation from a low-power mode ADC If an ADC conversion is triggered when SYSOSC is disabled, an asynchronous fast clock request is generated to enable the SYSOSC (SYSOSC is required for correct ADC operation).

Fast CPU Event Handling

In addition to the peripheral event and activity fast clock request triggers, the SYSCTL can be configured to generate an asynchronous fast clock request upon any IRQ request to the CPU. This provides the lowest latency interrupt handling when the system is running at the LFCLK rate (32kHz), as the IRQ request will propagate through the wake-up logic at the SYSOSC rate (32MHz ) vs. the LFCLK rate (32kHz). When the FASTCPUEVENT bit is set in the SYSOSCCFG register in SYSCTL, any interrupt request to the CPU will also generate a fast clock request.

Asynchronous Fast Clock Request Logic

The logic for asserting a fast clock request is given in the following figure.

MSPM0Lxx Asynchronous Fast Clock Request Logic Figure 2-10 MSPM0Lxx Asynchronous Fast Clock Request Logic