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設(shè)計(jì)實(shí)現(xiàn)24秒計(jì)時(shí)器。要求：
（1）倒計(jì)時(shí)功能
（2）24秒復(fù)位鍵功能
（3）啟動(dòng)/暫停鍵功能
- #include<reg51.h>
- unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
- typedef unsigned int uint;
- uint i,j,f1=0;
- uint q=4,p=2;
- uint sum = 0;
- sbit P2_0=P2^0;
- sbit P2_1=P2^1;
- sbit P2_2=P2^2;
- sbit P2_3=P2^3;
- uint num2=0,num=24,shi=2,ge=4;
- void T1_time()interrupt 3
- {
- TH1=(65536-49000)/256;
- TL1=(65536-49000)%256;
- num2++;
- if(num2==20){
- num2=0;
-
- if(!f1){
- if(num!=0)num--;
- shi=num/10;
- ge=num%10;
- }
- }
- }
- void ex_int()interrupt 0
- {
- num=24;
- }
- void ex_int1()interrupt 2
- {
- sum++;
- if(sum%2==1)
- f1=1;
- else
- f1=0;
- }
- void delay()
- {
- uint j;
- for(j=0;j<200;j++);
- }
- void disply()
- {
- P2&=0XF0;
-
- P1=table[shi];
- P2_0=1;
- delay();
- P2&=0XF0;
-
- P1=table[ge];
- P2_1=1;
- delay();
- P1=0;
- P2&=0XF0;
- }
- main()
- {
- TMOD=0X10;
- TH1=(65536-49000)/256;
- TL1=(65536-49000)%256;
- EA=1;
- EX0=1;
- IT0=1;
- EX1=1;
- IT1=1;
- ET1=1;
- TR1=1;
-
- while(1)
- {
- disply();
-
- }
- }
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