Difference between revisions of "CSC270 Homework 9 Solutions 2012"
(Created page with "--~~~~ ---- <onlysmith> =Problem 1= The trick was to figure out the decoding of the address bus. * For Y3' to be activated, the 7442 signals need to be: A3 = 0, A2 = 0, A1 = 1, ...") |
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--[[User:Thiebaut|D. Thiebaut]] 16:55, 21 April 2012 (EDT) | --[[User:Thiebaut|D. Thiebaut]] 16:55, 21 April 2012 (EDT) | ||
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| − | < | + | <onlydft> |
=Problem 1= | =Problem 1= | ||
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=Problem 3= | =Problem 3= | ||
For this problem, we can use the setup of Problem #2, and use the output of the flip-flop to enable or disable a 500 KHz signal to reach the LED. This 500 KHz signal is simply E divided by 2. The figure below illustrates the whole thing. | For this problem, we can use the setup of Problem #2, and use the output of the flip-flop to enable or disable a 500 KHz signal to reach the LED. This 500 KHz signal is simply E divided by 2. The figure below illustrates the whole thing. | ||
| − | <center>[[Image:CSC270Hw9Pro3Sol2012.png]]</center> | + | <center>[[Image:CSC270Hw9Pro3Sol2012.png|700px]]</center> |
<br /> | <br /> | ||
| + | <source lang="asm"> | ||
| + | |||
| + | org 0000 | ||
| + | turnOFF: | ||
| + | ldaa 8000 | ||
| + | rts | ||
| + | |||
| + | oscillate: | ||
| + | ldaa 9000 | ||
| + | rts | ||
| + | |||
| + | </source> | ||
<br /> | <br /> | ||
<br /> | <br /> | ||
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<br /> | <br /> | ||
<br /> | <br /> | ||
| + | </onlydft> | ||
<br /> | <br /> | ||
<br /> | <br /> | ||
