SH79F161A P0口设成输入后都不到高低电平

2万 · 2022-5-5 22:04

我在调试的板有3个按键，分别是P00，P02，P10，外部电路是上拉10K到5V，下接1K到按键再接地，按键按下的时候是0.7V左右，不按是5V，但是只有P10能正常都到高低电平，P00，P02一直读到低电平，P00，P02的第二功能是AD和外部中断，但是我都关闭了这些功能。
void       MCUinit(void)
{
      EA=0;
      FLASHCON = 0;
      CLKCON=0x20;

      IPL0 = 2;
      IPH0 = 0;

      TCON=0;
      TR0=0;          //停止T0定时器
      ET0=0;          //禁止T0定时器

      TMOD=0x01;
      TH0= HIBYTE(T0_125US);
      TL0= LOBYTE(T0_125US);
      ET0=1;
      TR0=1;

///***************************************
//AD初始化设置:
//  ADC时钟周期=8Tsys
//  通道设置AN1、AN2、AN3为ADC口
//****************************************/
      ADT=0x6E;
      ADCH=0x00; //作为普通IO口

///***************************************
//外部中断初始化设置:
//  INT2、INT3下降沿触发
//****************************************/
      EXF0=0x10;
      IEN1=0x04;
/*************************************************************************8
ADC初始化
***************************************************************************/
      ADCH=0x00; //作为普通IO口
      ADT=0x6E;

      EA = 1;    //允许中断
}

void       PortDir(void)
{
      P0       =       Bin(11110111);//P0_2为按键输入,设置初始状态为1
      P0CR  =       Bin(01111000);//P0_2为按键输入,设置为输入
      P0OS |= 0X30;
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
      P1       =       Bin(00000001);//P1_6直流电机12V电源
      P1CR       =       Bin(01111110);//P1_6直流电机12V电源
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=

      P2       =       Bin(11110000);//P2_4为PWM0输出,设置初始状态为1
      P2CR       =       Bin(00011111);//P2_4为PWM0输出，设置为输出
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

+++++++=
      P3       =       Bin(00000000);
      P3CR       =       Bin(00000011);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++==
//上拉设置
      P0PCR       =       Bin(00110000);
      P1PCR       =       Bin(00000000);
      P2PCR       =       Bin(11100000);
      P3PCR       =       Bin(00000000);
}

main(void)
{
      Delay(100);    //系统启动延时
      MCUinit();    //MCU初始化
      Delay(100);
      PortDir();
      Delay(100);
while(1)
      {
            if(Flag2ms)
            {
                     Flag2ms=0;
                     RSTSTAT = 0x00;       //2730.6ms 清看门狗
                     KeyScan();
                     if(Key1)
                     {
                              LD2=0;
                     }
                     else
                     {
                              LD2=1;
                     }
                     if(Key2)
                     {
                              LD2=0;
                     }
                     else
                     {
                              LD2=1;
                     }
                     if(Key3)
                     {
                              LD2=0;
                     }
                     else
                     {
                              LD2=1;
                     }
            }
      }
}
LD2是外接的一个LED，=0就亮，=1就灭，我分别测试了Key1，Key2，Key3三部分按键程序，只有Key3不按的时侯LED会亮，按下时，LED灭了，Key1，Key2一直都是灭的