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PJRC Store 8051 Dev Board, $79 LCD 20x2 Display, $11 Serial Cable, $5 12 Volt Power, $8 More Components... 8051 Tools Main Page Software PAULMON Monitor Development Board Features Photos Getting Started Example Code Memory Map Ports & Pinouts Schematic & Parts Circuit Board Construction Troubleshooting Old Versions Revision List Rev 4 (2002) Photos & Features Getting Started Example Code Memory Map Ports & Pinouts Schematic & Parts Circuit Board Construction Troubleshooting Rev 3 (2001) Rev 2 (1997) Rev 1 (1992) Code Library 89C2051 Programmer Other Resources

8051 Development Board, Rev 4

Features:

• 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.

Requirements:

• 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!)

LCD Display Port

This is a backlight display with transmissive LCD. In bright lighting (as this photo) the characters appear as highly readable green against a dark blue background. In darkness, the characters are bright green against the darker background (which does pass a small amount of the backlight, yet still remains much darker than the displayed characters). Like all character modules, eight custom (graphic) characters may be downloaded to the display, in addition to the build-in character font.

Board Photo

A larger copy of this photo (110k) is available for your viewing pleasure.

Demo Programs Source Code

• blink.asm - LED Blink
• eraseblk.asm - Erase a 4K block of the Flash ROM
• lcd_tester.asm - Test the LCD Display (prints 2 messages)
• muxtest.asm - Test the mux between the two serial port connectors

This is the complete monitor code provided on the board:

• paulmon21.asm - PAULMON 2.1 Configured For This REV 4 Board
• extra.asm - Disassembler, Memory Editor and Single-Step Utilities
• pm21_2f4.hex - Intel Hex For 87C52 (these two compiled and merged together)