实验5.7z

#include <REGX52.H> #include "Delay.h" void Timer0Init(void) { TMOD &= 0xF0; //设置定时器模式 TMOD |= 0x01; //设置定时器模式 TL0 = 0x18; //设置定时初值 TH0 = 0xFC; //设置定时初值 TF0 = 0; //清除TF0标志 TR0 = 1; //定时器0开始计时 ET0=1; EA=1; PT0=0; } unsigned char Key_2=0; void main() { Timer0Init(); IT0 = 1; //设置为下降沿触发 EX0 = 1; //外部中断0中断允许位 EA = 1; while(1) { } } Int0() interrupt 0 using 1 { P1_2=0; Key_2=1; } void Timer0_Routine() interrupt 1 //1ms进入一次 { static unsigned int T0Count,x2=0; TL0 = 0x18; //设置定时初值 TH0 = 0xFC; //设置定时初值 T0Count++; if(T0Count>=100)//每100ms进入一次 { T0Count=0; if(Key_2==1) { x2++;// if(x2>50){P1_2=1;Key_2=0;x2=0;} } } }