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#include <reg51.h> #define uchar unsigned char #define uint unsigned int sbit P1_0=P1^0; void delay(uint k) { uint i; for(;k>0;k--) for(i=0;i<110;i++); } void main() { unsigned char i; TMOD=0X06; TH0=0xf6; TL0=0xf6; P1_0=0; EA=1; ET0=1; TR0=1; while(1){i=TL0;i=i-0xf6; P2=i;} } void time0_int(void) interrupt 1 { P1_0=1;delay(1000); P1_0=0; }