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 to accommodate those needs, but the resulting 1 MB 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 using integer arithmetic on its native 16-bit data, and are quite slow. The ARM Cortex-M4F architecture used in the MSP432 line allows up to 4 GB of unified program/data/peripheral memory, and has a built-in single precision IEEE754-compatible Floating Point Unit.
The peripherals in MSP432 are similar to those in MSP430, and there is a built-in ROM driver library that facilitates software reuse. Differences from MSP430 include:
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 tends to have less of the sophisticated peripherals such as wide 32/64-bit timer units, or the quadrature encoder blocks. In fall of 2017 TI expanded the family with higher performance parts containing Ethernet, USB, CAN and SPI peripherals. In 2017 the Tiva TM4C129 was rebranded as MSP432 "E-series". Several new subsystems were introduced in MSP432:
Port Mapping Controller maps built-in peripherals to physical pins
Power Control Manager switches between full speed and low power modes.
The MSP432 devices are named similarly to those of the MSP430. For instance MSP432P401RIPZT consists of the following pieces:
MSP432: Standard prefix.
P: Indicates a Performance and Low Power series device. 'E' denotes parts with built-in communication interfaces such as Ethernet, USB, CAN and SPI; those parts have a significantly higher power envelope.
4: First digit '4' indicates a flash 48 MHz device.
0: Second digit '0' indicates a General Purpose class, '1' has expanded peripherals such as an LCD controller.
1: Third digit '1' denotes peripheral configuration including 1 MHz 14-bit ADC.
R: Fourth digit 'R' indicates 256 KB of Flash and 64 KB of SRAM, whereas 'M' indicates 128 KB of Flash and 32 KB of SRAM, 'V' means 512 KB Flash and 128 KB SRAM, 'Y' means 1024 KB Flash and 256 KB SRAM, and '1' denotes 2048 KB Flash and 256 KB SRAM.
T: following the 4xxx model designator seems to denote lower clock version that has lower overall power consumption but higher leakage
I: Temperature range: S = 0...50 °C, I = -40...85 °C, T = –40..105 °C.
PZ: Packaging code
T: Distribution format: small reel
MSP432P4xx
The first released MSP432 general purpose chip family, expanded in fall of 2017:
up to 2048 KB flash memory
up to 48 MHz system clock, programmable for speed/power tradeoff
Ethernet with 100Mbit/s support using either internal or external PHY, internal PHY supports IEEE 1588 PTP
External Peripheral Interface for SDRAM support, with 8/16/32-bit bus width support up to 150 MB/sec
two 12-bit SAR ADC supporting up to 2 MSPS and internal or external voltage reference
three analog comparators
16 digital comparators
up to ten I2C interfaces
up to two CAN 2.0A, 2.0B interfaces
up to four SSI interfaces supporting bi- or quad-SSI operation
up to eight UART interfaces
DSP and AES256 accelerator with 128-, 192- and 256-bit AES and 32-bit CRC along with DES w/ 168-bit key length, SHA-1, SHA-2 and MD5 hashing
four tamper detect inputs
one quadrature encoder input peripheral and up to 8 PWM outputs
real-time clock/calendar
JTAG and two-pin SWD debug interface with Serial Wire Trace and power debug and profiling
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-EXP432P4111 Launchpad
Similar to the P401R launchpad, this supports a larger chip with 2 MB flash, 256 KB SRAM and also has a 320-segment LCD display leveraging the chip's LCD_F peripheral.
