MA84G564键盘中断问题

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toney20110101| 实习生

楼主 | 2013-4-21 14:30 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

4G, 键盘, TI, timer, TIMER0

请帮忙看一下，下面的程序为啥板子通电后没按任何按键的情况下，蜂鸣器器就会叫。
#include "REG_MA84G564.H"

#define T0_1MSL       0x18                // ( 65536 - 1000 )%256 in 12Mhz
#define T0_1MSH       0xFC                // ( 65536 - 1000 )/256 in 12Mhz

unsigned char T0Cnt;

void INT_TIMER0(void) interrupt 1 using 1       // Timer0 Interrupt
{
WDTCR = 0x17;                               // Reset Watch Dog Timer

TR0 = 0;                                  // Disable Timer0

if ( T0Cnt )
{
T0Cnt--;
TL0 = T0_1MSL;
TH0 = T0_1MSH;
TR0 = 1;                            // Enable Timer0
}
}

void delayms( unsigned char X )
{
TR0 = 0;                                  // Disable Timer0
T0Cnt = X;                                  // X*1ms = Xms
TL0 = T0_1MSL;
TH0 = T0_1MSH;
TR0 = 1;                                  // Enable Timer0
while( T0Cnt );
}

void bell(void)
{
P24=0;
delayms(200);
P24=1;
delayms(100);
P24=0;
delayms(50);
P24=1;
delayms(100);
}

void INT_KB(void) interrupt 13
{
bell();
}

void main(void)
{
TMOD = 0x11;                               // Set Timer0/1 in Mode1/2 ( 16/8 bit )
  TR0 = 0;                                  // Desable Timer0
  ET0 = 1;

EIE1 |= 0x20;
EIP1H |= 0x20;
EIP1L |= 0x20;
KBPATN = 0xff;
  KBCON = 0x03;
  KBMASK = 0xff;                            // Will Disable KP Interrupt
AUXR1 &= 0x3f;

EA=1;

while(1);
}

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