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8051 Development Board, Rev 5

The 8051 development board provides an easy-to-use and low-cost way to develop your 8051 based microcontroller projects, without purchasing any other special equipment, such as IC programmers or emulators. All required software is available as a free download, including a C compiler!

Rev 5 Circuit Board Illustration


  • Standard 87C52 CPU clocked at 22.1184 MHz
  • 50 I/O lines!! All I/O lines are clearly labeled and available at the edge of the prototype construction area.
  • 32k SRAM, program variables and code (24k usable for code download)
  • 30k Flash ROM, non-volatile program storage and data logging
  • High speed baud rates: 115200, 75600, 38400, etc. All standard baud rates are supported (except 300 baud)
  • Display port, works with standard character-based LCDs. A 16x2 display will be available from PJRC (see photo below)
  • Eight LEDs, controlled by 8 dedicated I/O lines (not shared with the 50 I/O lines)
  • Bus expansion with 4 chip select signals, for adding UARTs, A/D converters and other bus-based peripheral chips.
  • Unregulated, polarity-protected DC voltage input with 2 position terminal block.
  • PAULMON2 monitor for easy code development without additional equipment.

LCD Display Port

The 8051 development board's LCD port provides the 14 signals needed for standard character based LCD modules. A 20x2 display is available from PJRC:

Optional Display


  • DC Voltage, 8 to 15 volts (regulated), 50 mA or 300 mA with LCD.
  • PC Computer With Serial Port, Linux or Microsoft Windows 95-OSR2, 98, 98SE, NT4, 2000.
  • Assembler or Compiler, usually AS31 or SDCC
  • Terminal Emulation Program, eg Hyperterminal (windows), Minicom (linux)
  • Text Editor Program, eg Notepad, Vi, Emacs
  • Standard 9 pin serial cable (straight through, not null-modem!)

8051 Development System Circuit Board, Rev 4, Paul Stoffregen
Last updated: February 25, 2005
Status: finished
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