16 MHz core, 2 KB Flash — what the memory budget means for firmware
The MSP430G2213IPW20 runs the MSP430 CPU16 core at 16 MHz, with 2 KB of on-chip Flash program memory and 256 x 8 bytes of RAM. For a typical sensor-node firmware — a main loop polling an ADC, logging a few bytes, and driving a PWM output — the Flash holds the application code plus the MSP430 peripheral library, while the RAM covers the stack and a small data buffer. If the application requires a full RTOS or a large lookup table, the 2 KB ceiling forces either code compression or a move to a higher-density member of the MSP430G2xx family.
Sixteen I/O lines in the 20-TSSOP package give enough pins for a small keypad, a few LEDs, and a serial interface. The connectivity block includes I²C, SPI, UART/USART, IrDA, and LINbus — enough to talk to common sensors (temperature, humidity, pressure) over I²C or SPI, and to a host controller over UART.