Description: 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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