- #include <reg52.h>
- typedef unsigned char uchar;
- typedef unsigned int uint;
- sbit Key1=P3^0;
- sbit Key2=P3^1;
- sbit PWM=P1^0;
- uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
- uchar count,time,i;
- void delayms(uint k)
- {
- uint i,j;
- for(i=k;i>0;i--)
- for(j=110;j>0;j--);
- }
- void Timer0Init() //100微秒@12.000MHz
- {
- TMOD |= 0x02; //設(shè)置定時(shí)器模式
- TL0 = 0x9C; //設(shè)置定時(shí)初值
- TH0 = 0x9C; //設(shè)置定時(shí)重載值
- TF0 = 0; //清除TF0標(biāo)志
- TR0 = 1; //定時(shí)器0開始計(jì)時(shí)
- EA=1;
- ET0=1;
- }
- void display()
- {
- static bit num=0;
- P0 = 0x00;
- if(num)
- {
- P2=~0xfe;
- P0=table[i/10];
- num=~num;
- }
- else
- {
- P2=~0xfd;
- P0=table[i%10];
- num=~num;
- }
- }
- void main( )
- {
- Timer0Init();
- count=99;
- i=100-count;
- while(1)
- {
- if(!Key1) //
- {
- delayms(10);
- if(!Key1)
- {
- if(count>1)
- count--;
- while(!Key1);
- i=100-count;
- }
- }
- if(!Key2)
- {
- delayms(10);
- if(!Key2)
- {
- if(count<99)
- count++;
- while(!Key2);
- i=100-count;
- }
- }
- }
- }
- void timer0() interrupt 1
- {
- time++;
- if(count>=time)
- PWM=1;
- else PWM=0;
- if(time>99)
- time=0;
- if(time%10==0)
- display();
- }
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