文件名称:Text3
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秒计数可用20次50ms的计数溢出来实现。50ms的计数可选用T0方式1，16位定时方式，定时器初始值应为
65536-50×1000×11.0592/12=19456=4C00H
考虑中断响应时间及重装定时器初始值的时间共计约4个机器周期，定时器初始值加4（即4C04）。
秒计数值通过P2口输出，用LED指示灯显示。
-20 seconds count can be achieved 50ms overflow count. Count of 50ms means 1,16 can choose T0 bit timing means, the timer initial value should be 65536-50 × 1000 × 11.0592/12 = 19456 = 4C00H consider reload timer interrupt response time and total time of the initial value of about 4 machine cycles, the timer initial value plus 4 (ie, 4C04). Seconds through the P2 port output value, with LED indicators.
65536-50×1000×11.0592/12=19456=4C00H
考虑中断响应时间及重装定时器初始值的时间共计约4个机器周期，定时器初始值加4（即4C04）。
秒计数值通过P2口输出，用LED指示灯显示。
-20 seconds count can be achieved 50ms overflow count. Count of 50ms means 1,16 can choose T0 bit timing means, the timer initial value should be 65536-50 × 1000 × 11.0592/12 = 19456 = 4C00H consider reload timer interrupt response time and total time of the initial value of about 4 machine cycles, the timer initial value plus 4 (ie, 4C04). Seconds through the P2 port output value, with LED indicators.
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Text3.c
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