Evaluation Boards • Extension modules for Exp-Boards I+II •
All extension modules can be attached to one or several of the extension ports of the MC Experimenting Boards. To do that there should be the same kind of 16 pin connectors on the extension modules like they are on the Experimenting Board. The connection is then realized through a 16 pole flex with 16 pole plugs (Like in PC's: Harddrive IDE or Floppydisk cable, but in this case with only 16 poles).
The extension ports are basically all build the same way. This way most extension modules can be attached as needed to one of the extension ports and combined as desired with other modules.
The connection cable can be build easily and cheaply: Simply squeeze a 16 pole flex cable into a 16 pole plug. Just make sure it is put together the right way.
Ready extension modules with schematics and layouts
- Simple display module...
- 8 digit 7 segment display module...
- Relay module...
- RAM module...
- RS 232 module...
Extension port pin out
PIN 1: +5 Volt from the voltage regulation of the Experimenting Board
PIN 3: Positive power supply voltage, unregulated from the terminal of the Experimenting Board
PIN 5: Oscillator line XTAL 1 of the microcontroller (for each port detachable through DIP-switch "Px-XTAL")
PIN 7: Reset line RST of the microcontroller (through DIP-switch"P-RST" disconnectable)
PIN 9: Port 0,1,3: Serial port interface RxD (=P3.0) of the microcontroller
Port 2: P3.6/WR
PIN 11: Port 0,1,3: Serial port interface TxD (=P3.1) of the microcontroller
Port 2: P3.7/RD
PIN 13: Experimental board I: empty
Experimental board II:
- Port 0: ALE/PROG
- Port 1: EA/VPP
- Port 2: PSEN
- Port 3: EA/VPP
PIN 15: Ground of the Experimenting Board
PIN 2, 4, 6, 8, 10, 12, 14, 16: Port lines 0-7 of the connected port (x), whereas pin 2 carries the port line x.0 and pin 16 carries the port line x.7. There is no port line 3.6 in these microcontrollers, that is why line 14 will not be used when connected to the 3rd port.
The connector has an opening on the side. This prevents that you can insert the plug the wrong way. The opening is marked in the upper drawing with the number 16 in a small square (NOT the pin number 16).
Connecting of extension modules
The flex cable should come from the side of the Experimenting Board and then it should be bend to the top or bottom in a 90 degree angle. This offers two advantages: On one side on most extension modules the connector pins with the port lines will point "into" the board. This way the layout of most extension modules can be kept more simple than if the pins with the port lines would point to the edge of tht board. The second advantage is that the extension modules would have more space than if they would lay next to each other connected to the outstretched flex.
The extension possibilities of the Flash MC Experimenting Boards
Here are only some examples of possible expansion modules:
Input area:
- Keys Board
- Keyboard block
- PC-Keyboard connection
Indication area:
- LC-display
- LED display modules
- 7 segment fields
Output area:
- Relay board
- Stepper motor control
- PC-Printer control
Sensor technology area:
- Temperature sensors
- Infrared sensors
- AD converter
Other areas:
- RAM expansion
- DA converter
- PC connection serial and parallel
