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用stc89c52單片機(jī)做了一個(gè)串口控制燈，結(jié)果加了看門(mén)狗后，就燒錄不了別的程序了，大神幫忙看一下問(wèn)題出在哪里
#include<reg52.h>
sfr WDT_CONTR=0xe1;
sbit beep=P1^5;
sbit G_led=P1^2;
sbit B_led=P1^3;
sbit R_led=P1^4;
sbit timekey=P3^2;
static unsigned char Rdata;
void delay(unsigned int a) //1ms
{
unsigned int i;
while(--a!=0)
{
for(i=0;i<1000;i++);
}
}
void timer0init()
{
TMOD|=0X09;
TH0=0XFF;
TL0=0X9C;
ET0=1;
EA=1;
TR0=1;
}
void UART_init()
{
SCON=0X50;
TMOD=0X20;
PCON=0X80;
TH1=0XCC;
TL1=0XCC;
ES=1;
EA=1;
TR1=1;
}
void main()
{
WDT_CONTR=0x35;
timekey=0;
R_led=0;
G_led=1;
B_led=0;
beep=0;
UART_init();
timer0init();
while(1)
{
delay(100);
WDT_CONTR=0x35;
}
}
void Usart() interrupt 4
{
Rdata=SBUF;
switch(Rdata)
{
case'1':B_led=0;G_led=1;R_led=0;beep=0;timekey=0;break;
case'2':B_led=1;G_led=0;R_led=0;beep=0;timekey=0;break;
case'3':B_led=0;G_led=0;R_led=1;timekey=1;break;
}
RI=0;
SBUF=Rdata;
while(!TI);
TI=0;
}
void Timer0() interrupt 1
{
static unsigned int i;
static unsigned int j;
TH0=0XFF; //?????????????????1ms
TL0=0X9C;
i++;
j++;
if(i==5000)
{
i=0;
R_led=~R_led;
}
if(j==5000)
{
j=0;
beep=~beep;
}
}
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