Microchip PIC16F877-20I/PT, 8bit PIC Microcontroller, PIC16F, 20MHz, 14 kB Flash, 44-Pin TQFP

A newer device is available. Please consider the PIC16F887. This powerful (200 nanosecond instruction execution) yet easy-to-program (only 35 single word instructions) CMOS FLASH-based 8-bit microcontroller packs Microchip's powerful PIC® architecture into an 40- or 44-pin package and is upwards compatible with the PIC16C5X, PIC12CXXX and PIC16C7X devices.

High performance RISC CPU:
Only 35 single word instructions to learn
All single cycle instructions except for program
branches which are two cycle
Operating speed: DC - 20MHz clock input:
DC - 200 ns instruction cycle
Up to 8K x 14 words of FLASH Program Memory,
Up to 368 x 8 bytes of Data Memory (RAM)
Up to 256 x 8 bytes of EEPROM Data Memory
Pinout compatible to the PIC16C73B/74B/76/77
Interrupt capability (up to 14 sources)
Eight level deep hardware stack
Direct, indirect and relative addressing modes