单片机24秒倒计时c语言,关于单片机24秒倒计时添加按键控制程序的问题

给你改成单键控制开始、暂停、继续的24秒倒计时。

#include

#define uchar unsigned char

#define uint unsigned int

sbit dula=P2^6;

sbit wela=P2^7;

sbit key1=P3^4;

uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,

0x7d,0x07,0x7f,0x6f,0x40};

uchar num=0,miao=0;

bit zantin=0;

void delayms(uint);

void keyscan();

void display();

void main()

{

TMOD=0x01;

TH0=(65536-45872)/256;

TL0=(65536-45872)%256;

EA=1;

ET0=1;

TR0=1;

while(1)

{

keyscan();

display();

}

}

/***********按键扫描程序****************/

void keyscan()

{

static uint count1=0;        //计数变量

static bit key_sign=0;                                        //按键状态标志