Description: Stopwatch design frequency f = 1.1931816MHz. Timer 0 output square wave frequency: fout = 1.1931816/65536 = 18.2Hz output square wave of period Tout = 1/18.2 = 54.945ms. 8253A cause an interrupt every 55ms, as the timing signals, 5s/55ms = 91, so 91 is 5 seconds break.
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8253秒表设计\20044140603-奚伟辉.doc
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8253秒表设计
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