基于单片机的秒表暂停，启动

#include <reg52.h> #include "led.h" code unsigned char smgduan1 [] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; code unsigned char smgduan2 [] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; unsigned char T0RH = 0; unsigned char T0RL = 0; unsigned int cnt; unsigned int cna; signed char sec; void CT0(unsigned int); void main() { cnt = 0; sec = 19; CT0(10); EA = 1; TR0 = 1; while(1) { Led(0,smgduan1[sec%10]); Led(1,smgduan2[sec/10]); if(KEY0==0) { TR0=0; sec = 19; } if(KEY1==0) { TR0=~TR0; } while(KEY1==0) { Led(0,smgduan1[sec%10]); Led(1,smgduan2[sec/10]); } } } void CT0(unsigned int ms) { unsigned long tmp; tmp = 11059200/12; tmp = (tmp*ms)/1000; tmp = 65536 - tmp; tmp = tmp + 18; T0RH = (unsigned char)(tmp>>8); T0RL = (unsigned char)tmp; TMOD &= 0xf0; TMOD |= 0x01; TH0 = T0RH; TL0 = T0RL; ET0 = 1; } void TM0() interrupt 1 { TH0 = T0RH; TL0 = T0RL; cnt++; if(cnt >= 100) { cnt = 0; sec--; } if(sec == 0) { cna=0; while(1) { if(KEY0==0) { TR0=0; sec = 19; } cna++; Led(0,smgduan1[0]); Led(1,smgduan2[0]); if(cna >= 50) { LSA = 1;LSB = 1;LSC = 1; cna = 0; Delayms(500); } } } } void Delayms(unsigned int xms) { unsigned int j,k; for(j = xms;j >0;j --) { for(k = 110;k > 0;k--); } }