8051 Microcontroller | Pin Diagram & Projects

About 8051

8051 microcontroller is an 8 bit microcontroller designed by Intel in the year 1981. It was known as system on a chip as it had 40 DIP pins, 128 bytes of RAM, 4K byte of on-chip ROM, two timers, one serial port, and 4 ports (8-bit wide), all on a single chip. It includes four parallel 8-bit ports, that can be programmed or addressed per need. An onboard 12 Mhz on-chip crystal oscillator is included in the microcontroller.

8051 Pin Details

  • 8051 Microcontroller is a 40 pin PDIP (Plastic Dual Inline Package) Controller
  • 4 Ports and 40 Pins are used to manage all I/O operations.
  • I/O operation port has 32 pins reserved.
  • The other 8 pins are designated as Vcc, GND, XTAL1, XTAL2, RST, EA, ALE/PROG, PSEN.
  • Please refer the video for detailed explanation.


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