The PIC16F627A-I/SO is a 8-bit fully-static Flash-based CMOS Microcontroller. The PIC16F627A features 4MHz internal oscillator, 128 bytes of EEPROM data memory, a capture/compare/PWM, a USART, 2 comparators and a programmable voltage reference. The PIC16F627A have enhanced core features, an eight-level deep stack and multiple internal and external interrupt sources. The separate instruction and data buses of the Harvard architecture allow a 14-bit wide instruction word with the separate 8-bit wide data. The two-stage instruction pipeline allows all instructions to execute in a single cycle, except for program branches (which require two cycles). A total of 35 instructions (reduced instruction set) are available, complemented by a large register set. The PIC16F627A device have integrated features to reduce external components, enhancing system reliability and reducing power consumption. The PIC16F62X series fits in applications ranging from battery chargers to low power remote sensors.