Case study
Create a closed control program on the Z80 (Zilog80) microprocessor program as follows:
1. Port A LED display will count up if, S1 is pressed / ON and port A LED display will stop if S0 is pressed / OFF.
2. Closed control program to display the up and down relationship on port A:
- If S0 and S1 = off, the LED on port A stops counting.
- If S0=0, and S1=0, the LED on port A counts up.
- If S0=0, S1=1, the LED on port A counts down.
Solution 1
Closed Control Program
Solution 2
Flow Chart Program Control
Information:
- S0 = 1, up
- S0 = 0, stop
- S1 = 1, down
- S1 = 0, stop