为什么按键加，设置时间999分钟为上限，为什么加到255自动复位从0开始？附单片机代码 -

#include "CH554.H"
#include "Debug.H"
#include "GPIO.H"
#include "HT1621.H"
#include "Timer.H"
#include "stdio.h"
#include <string.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
// // 0 1 2 3 4 5 6 7 8 9
uchar code tabe1[11] = {0xF0,0x00,0xD0,0x90,0x20,0xB0,0xF0,0x10,0xF0,0xB0};
uchar code tabe2[11] = {0xA0,0xA0,0x60,0xE0,0xE0,0xC0,0xC0,0xA0,0xE0,0xE0};
sbit key1 = P3^3; //分钟加
sbit key2 = P3^4; //分钟减
uchar min,min0,min1,min2,sec,sec1,sec2,count;
void delay_ms(uint z) //延时程序1
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
/*******************************************************************************
* Function Name : void Display_Init()
* Description : 时间显示
*******************************************************************************/
void Display_Init(uchar min0,uchar min1,uchar min2,uchar sec1,uchar sec2)
{
Write_1621(3,tabe1[min0],4);
Write_1621(4,tabe2[min0],4);
Write_1621(5,tabe1[min1],4);
Write_1621(6,tabe2[min1],4);
Write_1621(7,tabe1[min2],4);
Write_1621(8,tabe2[min2],4);
Write_1621(11,tabe1[sec1],4);
Write_1621(12,tabe2[sec1],4);
Write_1621(13,tabe1[sec2],4);
Write_1621(14,tabe2[sec2],4);
}
/*******************************************************************************
* Function Name : void Timer0_Init()
* Description : 定时器初始化
*******************************************************************************/
void Time0_Init()
{
count = 0;
min = 0;
sec = 59;
mTimer0Clk12DivFsys(); //T0定时器时钟设置
mTimer_x_ModInit(0,1); //T0定时器模式设置
mTimer_x_SetData(0,0xC350); //T0定时器赋值
mTimer0RunCTL(1); //T0定时器启动
ET0 = 1; //T0定时器中断开启
EA = 1;
}
/*******************************************************************************
* Function Name : mTimer0Interrupt()
* Description : CH554定时计数器0定时计数器中断处理函数
*******************************************************************************/
void mTimer0Interrupt( void ) interrupt INT_NO_TMR0 using 1 //timer0中断服务程序,使用寄存器组1
{
mTimer_x_SetData(0,0xC350); //非自动重载方式需重新给TH0和TL0赋值
count++;
if(count==10)
{
count=0;
if(sec==0)
{
if(min!=0)
{
sec=59;
min--;
}
else
{
mTimer0RunCTL(0); //T0定时器停止
}
}
else sec--;
}
}
void main( )
{
Time0_Init();
Init_1621(); //初始化HT1621
HT1621_all_off(); //清空LCD显示
while(1)
{
if(key1==0)
{
delay_ms(100);
if(key1==0)
{
if(min!=999)
{
min++;
}
}
while(!key2);
delay_ms(1000);
while(!key2);
}
if(key2==0)
{
delay_ms(100);
if(key2==0)
{
if(min!=0)
{
min--;
}
}
while(!key1);
delay_ms(1000);
while(!key1);
}
min0=min/100;
min1=min%100/10;
min2=min%10;
sec1=sec/10;
sec2=sec%10;
Display_Init(min0,min1,min2,sec1,sec2);
}
}

复制代码