Simulator Project Instructions, Slides of Microprocessor and Interfacing

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Simulator Project

Simulator Project

• Overview of the project
• Some specific items to note

Step 2

• Write code that does the following
  • The switch on PC0 is the count ON/OFF switch.
    • When it is OFF the counter does not run.
    • When it is ON, the counter runs. (ON = 1)
  • The switch on PC1 is the count up/count down switch - When it is OFF, the counter counts up. - When it is ON, the counter counts down (ON = 1)
  • The byte display of the A accumulator shows the count. The display be in decimal, so count in BCD.

BCD adjustment

• When counting up – what adjustment is needed in BCD? - Currently at $19 – do an INCA – what do you get? - Get a $1A but want $
• When counting down – what adjustment is needed in BCD? - Currently at $20 – do an DECA – what do you get? - Get $1F but want $19. - Do a DAA and get $ - How to solve? - Must look at each digit of the two independently.

Sim Proj 2 – extra credit

• Modify your code from Sim Proj 1 to add the following
  • Add a second 2 digit 7 segment display, this time to port B.
  • Use it and the display from the A accumulator to display time in a 12 hour format.
  • To stay in the 12 hour format the minutes (A accumulator) will count to 59 and then roll over to 00, incrementing the hour.
  • The run button will be modified to a set function. When pressed the hours or minutes will be adjusted.
  • The up/down button will be used to select minutes or hours to set.
  • When running you will only increment the minutes digit every minute in a real application. For this assignment and to allow testing have it change every 3 to 4 seconds. You can do this by writing a new subroutine for this delay that calls the previous delay routine a number of times.