用杜邦線一端接地另一端觸碰P3.2觸發外部中斷，同時按下S2、S14也可觸發外部中斷。數碼管交替顯示012345和6789Ab。
- #include <REG51.H>
- #define uint unsigned int
- #define uchar unsigned char
- sbit dula=P2^6;
- sbit wela=P2^7;
- //順序共陰極數碼管段碼表，段碼a-h順序接PX0-PX7
- uchar code table[]={//共陰數碼管段碼"0~f-."
- 0x3f,0x06,0x5b,0x4f,
- 0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,
- 0x39,0x5e,0x79,0x71,0x40,0x80};
- uchar num,num1;
- uchar table1[]={0x06,0x5b,0x4f,0x66,0x6d,0x7d};
- uchar table2[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf};
- uchar table3[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
- bit flag;
- void delayms(uint xms)
- {
- uint i,j;
- for(i=xms;i>0;i--)
- for(j=110;j>0;j--);
- }
- void extern0()interrupt 0
- {
- flag=~flag;
- }
- void main()
- {
- IT0 = 1;//set INT0 int type (1:Falling 0:Low level)
- EX0 = 1;
- EA = 1;
- while(1)
- {
- P0=0x00;//消隱
- dula=1;//鎖存
- dula=0;
- P0=~(0x01<<num);//位碼
- wela=1;//鎖存
- wela=0;
- if(!flag)
- P0=table[num];//段碼
- else
- P0=table[num+6];//段碼
- dula=1;//鎖存
- dula=0;
- delayms(1);
- num=++num%6;
- }
- }
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