This application note shows how to emulate PORT 1 and 3 so you can test the various port
statements from within the BASCOM LT IDE.
The schematic is almost the same as for the MCS Flashprogrammer
2 PCF 8574 I/O extenders are used which are controlled by an I2C interface.
Users of the MCS Flashprogrammer can use the programmer to simulate PORT 1 (port 3 not supported)
You can make a cable which connects P1 of the flashprogrammer (with a piggy-back) to the
target system(the AT89C2051 socket).
Take care not to insert a chip into the programmer when used as a siulator!
You need version 1.11 of the IDE to use this new functionality.
A simple program demonstrates the simulator :
Connect 8 LED via 330 ohm resistors to P1. Simulate the program and see what is happening.
I used a dontronics DT003 power-board as a basis, a DT203 led/button board for the leds and a
dontronics prototypeboard to connect P1 of the flashprogrammer to the datalines of the SIMM-bus.
Dim a As Byte
P1 = 1
For a = 1 to 8
Rotate P1 , Left
Next
For a = 1 to 8
Rotate P1 , Right
Next
End
* Note that this application note uses library version 1.11 *
Schematic:
