程序如下：- #include<at89x52.h>
- #define uchar unsigned char
- #define uint unsigned uint
- sbit k1=P3^2;
- uchar code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
- void delay10ms(uchar a)
- {
- uchar b,c;
- for(c=1;c>0;c--)
- for(b=38;b>0;b--)
- for(a=130;a>0;a--);
- }
- void keyscan()
- {
- uint flag=0;
- if(k2==0X00)
- {
- delay10ms(1);
- if(k2==0X00)
- {
- P2=0xFF;
- flag=!flag;
- }
- }
- }
- void main()
- {
- TMOD=0x02;
- TH0=0xf6;
- TL0=0xf6;
- ET0=1;EA=1;
- TR0=1;
- while(1);
- }
- void time() interrupt 1 using 0
- {
- uint flag=0;
- uchar temp;
- uchar i;
- if(flag==1)
- {
- temp=0x80;
- for(i=0;i<4;i++)
- {
- P0=tab[i+1];
- P2=~temp;
- temp=temp>>1;
- P2=0xff;
- }
- }
- }
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