NuMicro® MS51 industrial series microcontrollers is based on 1T 8051 core, running at up to 24 MHz, with up to 32 Kbytes Flash and up to 2 Kbytes of SRAM. It supports one high precision 24 MHz allowing ± 1 % deviation and one 10 kHz internal RC Oscillators, operating at voltage from 2.4V to 5.5V and temperature from -40 ℃ to 105 ℃.