MSP430F2491TRGCT Texas Instruments - Yeehing Electronics

16 MHz MCU with 60KB Flash, 2KB SRAM, comparator, I2C/SPI/UART, HW multiplier

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The Texas Instruments MSP430 family of ultra-low power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applications. The architecture, combined with five low-power modes, is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The calibrated digitally controlled oscillator (DCO) allows wake-up from low-power modes to active mode in less than 1 µs.