Texas Instruments MSP430F2121IPW, 16bit MSP430 Microcontroller, MSP430, 16MHz, 4 kB Flash, 20-Pin TSSOP

Up to 16MHz CPU speed clock
Up to 120KB Flash memory
Up to 8KB SRAM memory
1.8V to 3.6V operation
Smart Analog and Digital
Low Power 200μA/MHz active mode
Low Power 0.7μA real-time clock mode
Low Power 0.1μA RAM retention
Ultra-Fast Wake-Up From Standby Mode in less than 6μs

MSP430 Microcontrollers, Texas Instruments

The MSP430 Platform is a range of mixed-signal, ultra-low power microcontrollers from Texas Instruments. The 16-bit RISC architecture is perfectly suited for wireless, low-power industrial and portable applications. This established range has a strong and popular position due to its ease of use and broad suite of development tools and support.
The MSP430 portfolio consists of over 400 devices ranging from the MSP430 Value Line to the revolutionary, highly integrated microcontrollers with embedded FRAM memory.This broad family of products offer integration suited to many designs and applications. High-performance peripherals include USB, RF, LCD controllers and Sigma-Delta ADCs. This allows designers to find the appropriate MSP430 device for many low power applications.