Lab10 i ZD Intel 8080/8085. Projektowanie sterownika windy.

Input Signals

Bits 8 and 7 are unused. Bit 6 is wired to the top call button. Bit 5 is wired to the bottom call button. If these buttons are clicked with the mouse, the corresponding bits come on. Bit 4 senses the lift and goes high when the lift cage reaches the bottom of the shaft. Bit 3 senses the lift and goes high when the lift cage reaches the top of the shaft.

Outputs

Bit 2 turns on the lift motor and the cage goes down.

Bit 1 turns on the lift motor and the cage goes up.

Ways To Destroy the Lift

• 1. Turn on bits 1 and 2 at the same time. This causes the motor to go up and down simulatneously!

  2. Crash the lift into the bottom of the shaft.

  3. Crash the lift into the top of the shaft.

  4. Run the simulation too slowly. Even if the code is logically correct, the lift crashes into the end of the shaft before the program has time to switch off the motor.