Description: With 8253 pairs of standard pulse counting, timing can be achieved. 1MHz with the board as a standard signal, the 8253 programmable counter/timer time constant in one million times, you can pin on the timer output 1 second hand high/low 1 second pulse signal. Since 8253 only sixteen per counter, can be achieved using two counters count a million times, to achieve the output state occurs once every second reversal.
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8253jishuqi.txt
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