16-bit OTP MCU with integrated LCD and 14-bit ADC
It carries 16 KB of OTP program memory — one-time-programmable, so the firmware is locked at the factory — and 512 x 8 bytes of RAM, which is tight for stack and data buffers. The part integrates a 6-channel 14-bit ADC, a direct-drive LCD controller, a UART/USART serial interface, a power-on reset (POR), and a watchdog timer (WDT). The LCD driver and the 14-bit ADC make this device a fit for metering, instrumentation, and human-interface panels where firmware is finalized before production and field updates are not required.
OTP memory means no field updates
The 16 KB program memory is OTP (one-time programmable). Once the device is programmed, the code cannot be erased or rewritten. This locks the firmware at the factory, so any bug fix, feature change, or calibration update requires a new device. For production, this means the firmware must be validated thoroughly before programming. For sourcing, OTP parts are typically programmed by the distributor or a programming house before shipment; verify that your supply chain supports this step. The 512 x 8 RAM is small — budget for interrupt service routines and stack depth; a deep call tree or large local variables will overflow quickly.
The MSP430P325AIPM is marked as Obsolete by Texas Instruments. New designs should not target this part. Because OTP parts are programmed before shipment, verify that any stock you source is either unprogrammed (blank) or matches your firmware image exactly — a programmed part with different code is scrap.