16-bit MSP430 core with 1 KB Flash — what fits in that code space
The MSP430F2101TRGET: It carries 1 KB of program Flash (organized as 1K x 8 plus 256 bytes) and 128 bytes of RAM — a memory footprint that targets single-purpose control loops, sensor readout, or simple state machines where every byte of firmware is hand-optimised. The 16 I/O lines, internal oscillator, slope A/D converter, and built-in brown-out reset / POR / PWM / WDT peripherals cover basic embedded control without external components.
128 bytes RAM — the real constraint on what this MCU can run
The 128 x 8 RAM is the tightest resource on this part. A firmware engineer planning a design with the MSP430F2101TRGET needs to budget stack depth, interrupt context save, and any local variables against that 128-byte ceiling.
There is no official L* successor order code in the record, so a drop-in replacement from TI's current MSP430 portfolio is not confirmed. Buyers needing this exact order code for a BOM line — whether for repair, legacy production, or a design that cannot migrate — will find it through independent distribution channels. No lead-time or stock-count figures are carried here; the channel quote is the definitive answer.