ECE 265 – LECTURE 17 Simulator Project 8/7/ ECE265

Simulator Project  Overview of the project  Some specific items to note 8/7/ ECE265

Step 1 of the project – the setup  Start up THRSIM  Open a new code window  You will have a 2 digit 7 segment display to display the A register  You also need a switch. Connect it to pin PC0.  Connect a 2 nd switch to PC1. 8/7/2015ECE265 3

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. 8/7/2015ECE265 4

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 $20  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 $25  How to solve?  Must look at each digit of the two independently. 8/7/2015ECE265 5

Incorporate your delay subroutine  You wrote a routine to introduce delay  Incorporate that routine that the counts occur at approximately 1 second intervals 8/7/2015ECE265 6

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. 8/7/2015ECE265 7