What this MSP430 brings to a low-power control loop
The MSP430F123IRHBR: The 16-bit MCU from the MSP430x1xx family runs at 8 MHz with 8 KB Flash and 256 bytes of RAM. It integrates a Slope A/D converter, POR, PWM, WDT, SPI, and UART/USART, operating from 1.8 V to 3.6 V.
8 MHz core — enough for the sensor loop, not for DSP
The 8 MHz clock is the rated maximum. That is sufficient for periodic sensor reads, UART polling, or PWM generation. The 256-byte RAM and 8 KB Flash are the hard limits.
