User manual

11
Address
Command
Data
Comment
20
1
1
LED 1
21
2
8
Wait for 500 ms
22
1
8
LED 8
23
2
8
Wait for 500 ms
24
3
4
Jump –4
Listing 1: Alternating flash
If the desired result does not occur, check proper polarity of the LEDs first. It is also helpful to
measure some voltages. Always use, e.g., a digital multimeter in the 20 V range and leave the
minus connection at GND. All voltages are thus measured against GND:
VCC: 4.5 V
Reset: 4.5 V
Osc1: 1.5 V
E1 to E4: 4.5 V
A1: Alternating
A2, A3: 0V
A3: Alternating
3 Binary Counter and PWM Output
All digital inputs are pulled up with an internal resistor against VCC (pull-up resistor) and have a
quiescent voltage at the amount of the operating voltage. However, you can put each of the
inputs to GND with a wire or contact. When starting, the default programme reads the port
condition and evaluates it. Individual connections can be put on GND so that a zero condition is
read here. Depending on the result, different programmes are called.