你这个功能必须用到定时器，我给你参考下我临时写的程序。- //芯片为stc12c5a60s2,12T模式
- #include<reg52.h>
- typedef unsigned int uint_16;
- typedef unsigned char uint_8;
- sbit duan=P2^6;
- sbit wei=P2^7;
- sbit key = P3^2;
- uint_16 num;
- uint_8 keytmp;
- uint_8 EXT0Flag = 0;
- uint_8 code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//共阴数码管
- void delay(uint_16 tmp)//延时1ms
- {
- uint_16 i,j;
- for ( i = tmp; i > 0; --i)
- for(j = 110; j > 0; --j);
- }
- void display(uint_16 displaynum)
- {
- P0=0xff;
- wei=1;
- P0=0xfb;
- wei=0;
- duan=1;
- P0=table[displaynum / 10];
- duan=0;
- delay(5);
- P0=0xff;
- wei=1;
- P0=0xfd;
- wei=0;
- duan=1;
- P0=table[displaynum % 10];
- duan=0;
- delay(5);
- }
- void SysInit()
- {
- INT0 = 1;//下降沿有效
- EA = 1;
- EX0 = 0;
- IT0 = 1;
-
- }
- void keyInit()
- {
- if(key == 1)keytmp = key;
- }
- void main(void)
- {
- SysInit();
- keyInit();
- while(1)
- {
- if (key == 0)
- {
- if(key != keytmp){EX0 = 1;EXT0Flag = 1;}
- }
- display(num);
- }
- }
- void EXT0() interrupt 0
- {
- if(EXT0Flag == 1)num++;
- if (num == 100)
- {
- num = 0;
- }
- }
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