1.7中断

中断比我们之前写的（不断查询）要好的多。
可以实行并行工作

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1

中断源

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默认中断级别

EA 总中断允许位
ET 定时器
EX 外部中断
ES 串口中断

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练习

1. 使用定时器中断

#include
#define uchar unsigned char
#define uint  unsigned int
uint count;
void init()
{
    TMOD = 0x01; //定时器０工作模式１
    ET0 = 1;
    TH0 = 0x4b;
    TL0 = 0xfd;
    EA = 1;
    TR0 = 1;
}
int main()
{
    init();
    while(1)
    {
    }
    return 0;
}
void T0_time() interrupt 1
{   TH0 = 0x4b;
    TL0 = 0xfd;
    count++;
    if(count==20)
    {
        P1 = ~P1;
        count=0;
    }
}

2. 练习二

   
   
   

#include 
#include 
#define uchar unsigned char
#define uint  unsigned int
sbit we = P2^7;
sbit du = P2^6;
uchar count0=0,count1;//全局变量 存储定时器加一计数器溢出次数
uchar temp0,temp1 = 0x7f; //temp0负责数码管的值，temp1负责流水灯的值
uchar code leddata[]={ 
                0x3F,  //"0"
                0x06,  //"1"
                0x5B,  //"2"
                0x4F,  //"3"
                0x66,  //"4"
                0x6D,  //"5"
                0x7D,  //"6"
                0x07,  //"7"
                0x7F,  //"8"
                0x6F,  //"9"
                0x77,  //"A"
                0x7C,  //"B"
                0x39,  //"C"
                0x5E,  //"D"
                0x79,  //"E"
                0x71,  //"F"
                0x76,  //"H"
                0x38,  //"L"
                0x37,  //"n"
                0x3E,  //"u"
                0x73,  //"P"
                0x5C,  //"o"
                0x40,  //"-"
                0x00,  //熄灭
                0x00  //自定义
 
                         };

void delay(uint z) //1MS延时
{
    uint x,y;
    for(x = z; x > 0; x--)
        for(y = 114; y > 0 ; y--);
}

void display(uchar i)  //数码管显示函数
{
    uchar shi,ge;
    shi = i / 10;   //求模
    ge  = i % 10;   //求余
    
    P0 = 0xff;      //清除段码
    we = 1;
    P0 = 0xfe;      //点亮第一位数码管
    we = 0;

    du = 1;
    P0 = leddata[shi];
    du = 0;
    delay(1);

    P0 = 0xff;       //清除段码
    we = 1;
    P0 = 0xfd;      //点亮第二位数码管
    we = 0;

    du = 1;
    P0 = leddata[ge];
    du = 0;
    delay(1);   
}

/*中断服务特殊功能寄存器配置*/   
void init()
{
    
    TMOD = 0x11;        //定时器T1/T0 16为计数工作模式
    TH1 = TH0 = 0x4b;
    TL1 = TL0 = 0xfd;   //T1/T0 定时50ms
    ET1 = ET0 = 1;      //开T1/T0中断
    TR1 = TR0 = 1;      //启动T1/T0
    EX0 = 1;            //开外部中断0
    IT0 = 0;            //外部中断0为低电平触发
    EA = 1;             //开总中断
}

void main()
{
    init();     //调用配置函数
    while(1)
    {
        display(temp0);//数码管显示
    }
}

void int0() interrupt 0 //外部中断0，中断服务程序
{
    TR0 = 0;            //关闭定时器0
}

/*定时器0中断服务程序*/
void timer0() interrupt 1   //T0内部查询顺序1
{
    TH0 = 0x4b;
    TL0 = 0xfd;             //定时器0再次放初值 50ms
    count0++;       
    if (count0 == 20)   
    {
        count0 = 0;
        temp0++;
        if (temp0 > 60)
        {
            temp0 = 0;
        }
    }
}

/*定时器1中断服务程序*/
void timer1() interrupt 3   //T1内部查询顺序3
{
    TH1 = 0x4b;
    TL1 = 0xfd;             //定时器1再次放初值 50ms
    count1++;       
    if (count1 == 10)   
    {
        count1 = 0;
        P1 = temp1; 
        temp1 = _cror_(temp1,1);//循环右移一次
    }
}