【51单片机C语言+Proteus仿真实例】报警器与旋转灯.zip

/*************** writer:shopping.w ******************/ #include <reg52.h> #include <intrins.h> #define uint unsigned int #define uchar unsigned char sbit SPK = P3^7; uchar FRQ = 0x00; void Delayms(uint ms) { uchar i; while(ms--) { for(i=0;i<120;i++); } } void main() { P2 = 0x00; TMOD = 0x11; TH0 = 0x00; TL0 = 0xff; IT0 = 1; IE = 0x8b; IP = 0x01; TR0 = 0; TR1 = 0; while(1) { FRQ++; Delayms(1); } } void EX0_INT() interrupt 0 { TR0 = !TR0; TR1 = !TR1; if(P2 == 0x00) P2 = 0xe0; else P2 = 0x00; } void T0_INT() interrupt 1 { TH0 = 0xfe; TL0 = FRQ; SPK = ~SPK; } void T1_INT() interrupt 3 { TH0 = -45000/256; TL0 = -45000%256; P2 = _crol_(P2,1); }