The MSP430F2121IDGVR: The MSP430F2xx series 16-bit MCU runs at 16 MHz with 4 KB Flash and 256 x 8 bytes of RAM.
Memory and data conversion — design constraints
The 4 KB Flash (4K x 8 plus 256 bytes) and 256 x 8 RAM set a firm firmware budget. Expect to fit a small state machine, a few calibration tables, and a UART or SPI driver — not a full RTOS or TCP/IP stack. The integrated slope A/D converter handles slow analog inputs (e.g., temperature or battery monitoring) without an external ADC, but its conversion rate is lower than a SAR type; factor that into the sampling interval.