Description: Programmable timer/counter (8253): 1, counter 0 is set to mode 0, the counter initial value N (N ≤ 0FH), individually manually enter the single pulse, the programming that counts on the screen, and also with OUT0 logical document level change observed (N+1 pulses when the input variable after the OUT0 high). 2, the counter 0, counter 1 is set to mode 3, respectively, counting the initial value is set to 1000, with the logic T OUT1 observed changes in output level (frequency 1HZ).
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1-2.asm
1-1.asm
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