SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
21.1 Introduction
The sequencer for acquisition, programmable pulse generator, and physical interface (SAPH or SAPH_A) is one of the submodules in the Ultrasonic Sensing Solution (USS or USS_A) module. The USS module is designed for analog-to-digital converter (ADC) based ultrasonic sensing technology in various measurement applications. See Section 18 for details.
The SAPH module features the PPG generator, and the SAPH_A module features the PPG_A generator. The SAPH_A is a superset of SAPH; therefore, SAPH_A is specifically named only when necessary to distinguish from the SAPH module.
The SAPH or SAPH_A consist of three blocks (see Figure 21-1):
- Acquisition Sequencer (ASQ)
- Programmable Pulse Generator (PPG or PPG_A)
- Physical Interface (PHY)
SAPH_A provides additional bias voltages for optional external signal conditioning like low-noise amplifiers (LNAs) and booster amplifiers.
- PPG or PPG_A block: Generates pulses at different frequencies.
- PHY block: Controls output channels and input channels of the USS module.
- ASQ block: The entire measurement sequence can be controlled by user software (called register mode) or by ASQ without any CPU intervention (called auto mode). The auto mode helps reduce the measurement power consumption, because the CPU can stay in LPM0 during measurement.
- External bias generator on SAPH_A
- SAPH registers: RegisterName or RegisterName.BitField
- Other module registers: ModuleNameRegisterName or ModuleNameRegisterName.BitField
- Code written for USS and SAPH modules is also accepted by USS_A and SAPH_A modules. The register names are resolved automatically.
NOTE
Naming convention for register names and bit fields:
NOTE
Before writing to any SAPH register with an offset address greater than 0x0F, unlock the registers by writing 0x45B to the KEY register. The unlock must be performed only once. Writing any other value to the KEY register locks the registers. Read accesses are always allowed.
Figure 21-1 USS or USS_A Block Diagram