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利用動態掃描和定時器1在數碼管上顯示出從765432開始以1/10秒的速度往下遞減直至765398并保持顯示此數，與此同時利用定時器0以500MS速度進行流水燈從上至下移動，當數碼管上數減到停止時，實驗板上流水燈也停止然后全部開始閃爍，3秒后（用T0定時）流水燈全部關閉、數碼管上顯示出“HELLO”。到此保持住。
- #include <reg52.h>
- #include <intrins.h>
- #define uchar unsigned char
- #define uint unsigned int
- sbit dula=P2^6;
- sbit wela=P2^7;
- uchar code table[]={
- 0x3f,0x06,0x5b,0x4f,
- 0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,
- 0x39,0x5e,0x79,0x71,
- 0x76,0x79,0x38,0x3f,0};
- uchar temp,t0,t1,bai,shi,ge,flag,flag1;
- uint shu;
- void init();
- void display(uchar,uchar,uchar,uchar,uchar,uchar);
- void delay(uint z)
- {
- uint t1,y;
- for(t1=z;t1>0;t1--)
- for(y=110;y>0;y--);
- }
- void main()
- {
- init();
- while(1)
- {
- if(flag1!=1)
- display(7,6,5,bai,shi,ge);
- else
- display(16,17,18,18,19,20);
- }
- }
- void init()
- {
- shu=432;
- temp=0xfe;
- P1=temp;
- TMOD=0x11;
- TH0=(65536-50000)/256;
- TL0=(65536-50000)%256;
- TH1=(65536-50000)/256;
- TL1=(65536-50000)%256;
- EA=1;
- ET0=1;
- ET1=1;
- TR0=1;
- TR1=1;
- }
- void timer0() interrupt 1
- {
- TH0=(65536-50000)/256;
- TL0=(65536-50000)%256;
- t0++;
- if(flag!=1)
- {
- if(t0==10)
- {
- t0=1;
- temp=_crol_(temp,1);
- P1=temp;
- }
- }
- else
- {
- if(t0%4==0)
- P1=~P1;
- if(t0==60)
- {
- TR0=0;
- P1=0xff;
- flag1=1;
- }
- }
- }
- void timer1() interrupt 3
- {
- TH1=(65536-50000)/256;
- TL1=(65536-50000)%256;
- t1++;
- if(t1==2)
- {
- t1=0;
- shu--;
- bai=shu/100;
- shi=shu%100/10;
- ge=shu%10;
- if(shu==398)
- {
- TR0=0;
- TH0=(65536-50000)/256;
- TL0=(65536-50000)%256;
- TR0=1;
- flag=1;
- t0=0;
- P1=0xff;
- TR1=0;
- }
- }
- }
- void display(uchar aa,uchar bb,uchar cc,uchar ba,uchar sh,uchar g)
- {
- dula=1;
- P0=table[aa];
- dula=0;
- P0=0xff;
- wela=1;
- P0=0xfe;
- wela=0;
- delay(1);
- dula=1;
- P0=table[bb];
- dula=0;
- P0=0xff;
- wela=1;
- P0=0xfd;
- wela=0;
- delay(1);
- dula=1;
- P0=table[cc];
- dula=0;
- P0=0xff;
- wela=1;
- P0=0xfb;
- wela=0;
- delay(1);
- dula=1;
- P0=table[ba];
- dula=0;
- P0=0xff;
- wela=1;
- P0=0xf7;
- wela=0;
- delay(1);
- dula=1;
- P0=table[sh];
- dula=0;
- P0=0xff;
- wela=1;
- P0=0xef;
- wela=0;
- delay(1);
- dula=1;
- P0=table[g];
- dula=0;
- P0=0xff;
- wela=1;
- P0=0xdf;
- wela=0;
- delay(1);
- }
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