Flexible and universal  8051- board

This board can be delivered with or without the mounted breadboard. Document : detailed description.

This small universal board is built around the 8051 microcontroller. It contains all necessary components to work on it's own, but it can be expanded with add-on boards. It accepts all 8051 flashcontrollers in PLCC44 package as far as the pin out conforms with the standard pinout. 

Hardware  :

• Multilayer board of 68 x 86 mm (2.68" x 3.39"), fits into an optional DIN-rail housing (4 modules width) and into many others.
• PLCC44 socket for 8051 controller, different types of FLASH-8051 can be used, a SST89C58 is supplied by default (*) . Types should be compatible with standard pin layout (see below)
• Software and PLD-configuration can be changed at any time.
• When used with Philips P89C51RB2 or compatible types, the software can be downloaded via RS232 by means of free tools ( Flashmagic, WinISP )
• PLCC20 socket for GAL, supplied with programmed GAL for address decoding for RAM and external I/O.
• 32K SRAM, addressable as programmed in GAL ( CODE, DATA or a mix )
• Total of 80 headerpins with demultiplexed address ( A0..A15, D0..D7 -> 24 separate pins ), all microcontroller signals + decoder outputs + I/O are on the headerpins, so by means of an optional breadboard many expansion units can be built without soldering on the mainboard.
• 4 address decoder for writing to outputs ( 2 occupied on the board , 2 free on the header pins )
  -> 16 TTL outputs on the board :  8 outputs are byte-addressable (HC541)
  -> 8 outputs are bit-addressable  (HC259)
• 4 address decoder for reading from inputs ( 1 occupied on the board , 3 free on the header pins)
• Serial port with RS232 levels, RxD, TxD and optional 2 handshaking signals ( jumpers to place ), supplied on 6 pin header with ground and supply
• Power supply 6 - 12 Volt DC, regulator on the board for 800mA at 5V, LEAD-battery of 6V is sufficient )
• Serial E2prom on board ( 24C64, 8K x 8 )
• Supply voltage supervisor
• Expandable I2C bus by 4-pins header for I2C bus (GND, SDA, SCL, VCC)
• 9 pins header for serial bus ( 1 input, 6 outputs, GND and VCC )  ( this serial bus is used for serial I/O expansion modules, but it could also be used for an SPI bus if not supplied with the micro controller ).
• On each corner a mounting whole is placed with grounded pads.
• CE compliant Class B, if mounted according to mounting instructions.