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  #1 (permalink)
Old 11th October 2008, 10:46 PM
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Post 8253 program
hey guys i've got this program to calculate time delay using 8253. pls help me with the codings. i don't get the logic.

MVI A,30H
OUT 0CEH
MVI A,05H
OUT 0C8H
MVI A,OOH
OUT 0C8H
HLT

pls help me guys!!!
thanks
Last edited by pria123; 12th October 2008 at 09:03 PM.
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Old 29th October 2008, 10:27 AM
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Default Re: 8253 program
MVI A,30H
OUT 0CEH
Here 30H is the value which is stored in the control word of 8253.

For control word operation please check the above figure,
OUT 0C8H
here 0C8h may be address of some device.
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