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PIC16F877A is a 40 pin 8-bit microcontroller from Microchip. It has 8 channel ADC(10-bit), 3 Timers(2[8bit],1[16bit]),8K Flash program memory,2 Comparators,15 interrupt sources,256 bytes of EEPROM,368 BYTES OF RAM,Serail comm with SSP & USART.