以查詢方式實(shí)現(xiàn)1s定時(shí)
[導(dǎo)讀]#includesbitLED=P0^2;unsignedintvT=0;voidmain(){LED=0;//點(diǎn)亮TMOD=0x01;//定時(shí)模式116位定時(shí)計(jì)數(shù)器TR0=1;//啟動(dòng)定時(shí)器0TH0=0x3C;//計(jì)數(shù)初值15536(65536-15536=50000*1us=50ms)TL0=0xB0;while(1){if(TF0==1){TF0=0
#includesbitLED=P0^2;unsignedintvT=0;voidmain(){LED=0;//點(diǎn)亮TMOD=0x01;//定時(shí)模式116位定時(shí)計(jì)數(shù)器TR0=1;//啟動(dòng)定時(shí)器0TH0=0x3C;//計(jì)數(shù)初值15536(65536-15536=50000*1us=50ms)TL0=0xB0;while(1){if(TF0==1){TF0=0;//清除標(biāo)志位vT++;if(vT==20)//20*50=1000ms=1s{vT=0;TH0=0x3C;//計(jì)數(shù)初值15536TL0=0xB0;LED=!LED;//溢出后切換led狀態(tài)}}}}
下載文檔
