Atmel AT89C51

 120
  • 8-bit microcontroller based on 8051 architecture

  • 4KB Flash programmable and erasable memory

  • 32 programmable I/O lines

  • Two 16-bit timers/counters

  • Full-duplex UART serial communication

  • On-chip oscillator and clock circuitry

Atmel AT89C52

 110
  • 8-bit microcontroller based on industry-standard 8051 architecture

  • 8KB in-system programmable Flash memory

  • 32 programmable input/output lines

  • Three 16-bit timers/counters

  • Full-duplex UART serial communication