TI MSP432

TI MSP432
Designer ARM/Texas Instruments
Bits 32-bit
Introduced 2015

The MSP432 is a mixed-signal microcontroller family from Texas Instruments. It is based on a 32-bit ARM Cortex-M4F CPU, and extends their 16-bit MSP430 line, with a larger address space for code and data, and faster integer and floating point calculation than the MSP430. Like the MSP430, it has a number of built-in peripheral devices, and is designed for low power requirements.

Comparison to MSP430/MSP430X

Modern embedded computing requires large amounts of data and code, and often calls for floating point calculations. The MSP430's 16-bit architecture was already once extended to 20 bits (MSP430X) to accommodate those needs, but the resulting 1MB limit is still too small, and the instruction set extensions slow down the code execution. Furthermore, MSP430 architecture does not include a hardware floating point unit. IEEE754 floating point computations are emulated in software[1] using integer arithmetic on its native 16-bit data, and are quite slow.[2]

The ARM Cortex-M4F architecture used in the MSP432 line allows up to 4GB of unified program/data/peripheral memory, and has a built-in single precision IEEE754-compatible Floating Point Unit.

Comparison of MSP430 and MSP432
MSP430 MSP430X MSP432
Address space 16 bits 20 bits 32 bits
Memory address space 64kB 1MB 1TB
Clock speed 25 MHz 48 MHz
Floating Point soft IEEE754 32 bit FPU
Typical Dhrystone 2.1 (DMIPS/MHz) 0.288 [3] 1.196
ULPBench low power score 120 167.4

The peripherals in MSP432 are similar to those in MSP430, and there is a built-in ROM driver library that facilitates software reuse.[4]

Differences from MSP430 include:

Relationship to other TI ARM Cortex-M devices

The MSP432 is similar to the Stellaris LM4F120 and Tiva-C TM4C123 parts previously available from TI. The MSP432 is slightly slower, cheaper and uses significantly less power, and it does not have a built-in USB block, wide 32/64 bit timer units, or the quadrature encoder blocks.

Several new subsystems were introduced in MSP432:

MSP432 devices

The MSP432 devices are named similarly to those of the MSP430. For instance MSP432P401RIPZT consists of the following pieces:

MSP432P4xx

The first released MSP432 general purpose chip family:

Hardware development platforms

MSP-EXP432P401R Launchpad

This Launchpad board is compatible with a suite of MSP430 stackable BoosterPacks, including the low-power SimpleLink Wi-Fi CC3100 BoosterPack. It includes a USB debugging interface that can be connected directly to the development workstation.

MSP-TS432PZ100 target board

This is a higher cost development board with a 100-pin LQFP ZIF socket used by initial MSP432 chips, and a JTAG and Spy Bi-Wire debug interfaces.

References

  1. ↑ MSP430 FP math library
  2. ↑ See section 9, FFT Benchmark
  3. ↑ DMIPS on MSP430 using MSP430F149 and CrossWorks compiler
  4. ↑ MSP432 Platform Porting Guide
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