void main ET1=1; EA=1; TR1=1; while1 xianshi; ifs1==0 delay10; TR1=~TR1; while!s1xianshi; delay10; ifs2==0 delay10; fangxiang=~fangxiang; while!
ET1=1:使能定时器1的中断
EA=1:使能总中断(即允许所有中断)
TR1=1:启动定时器1的计数器
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