請問一下
我將RA4設為輸出，當產生中斷後
RA4 輸出"恆"為1
可是現在有個問題...
我用LATAbits.LATA4=1 讓它輸出為1
可是當跑完這行程式後 它輸出狀態又跑回去0
並不會恆為 1 ，RA4照理說應該會鎖住在1才對吧？
有時我用debug模式讓他run還會跑出數錯誤的訊息
我是在main裡把他寫在while迴圈中
是否有高手前輩可以指點一下問題出在哪？

以下是source code
#include <p18f2221.h>
#include <usart.h>
#include <delays.h>
#include <timers.h>

char RX_Temp;
unsigned char aaaa=0;
void isr_high(void);
void isr_low(void);

//==================================
#pragma code lo_vector=0x18
void isr_low_code(void)
{
_asm GOTO isr_low _endasm
}
#pragma code

#pragma interrupt isr_low
void isr_low(void)
{
PIR1bits.RCIF=0;
RX_Temp = ReadUSART();
}
//==================================
#pragma code hi_vector=0x08
void isr_high_code(void)
{
_asm GOTO isr_high _endasm
}
#pragma code

#pragma interrupt isr_high
void isr_high(void)
{
if(INTCONbits.INT0IF==1)
{
INTCONbits.INT0IF = 0;
aaaa=1;
LATAbits.LATA4 = 1;
}

if(INTCON3bits.INT1IF==1)
{
INTCON3bits.INT1IF = 0;
}
}

void main()
{
OSCCON = 0x62;
OSCTUNE = 0x80;
OpenUSART(USART_TX_INT_OFF &
USART_RX_INT_ON &
USART_ASYNCH_MODE &
USART_EIGHT_BIT &
USART_CONT_RX &
USART_BRGH_HIGH,
25);

PIR1bits.RCIF=1;
PIE1bits.RCIE=1;
IPR1bits.RCIP=0;
RCONbits.IPEN=1;

INTCONbits.GIE=1;
INTCONbits.PEIE=1;
INTCONbits.TMR0IE=0;
INTCONbits.INT0IE=1;
INTCONbits.RBIE=0;

INTCON2bits.RBPU=1;
INTCON2bits.INTEDG0=1;
INTCON2bits.INTEDG1=1;
INTCON2bits.TMR0IP=0;
INTCON2bits.RBIP=0;

INTCON3bits.INT1IE=1;
INTCON3bits.INT2IE=0;
INTCON3bits.INT1IP=1;
INTCON3bits.INT2IP=0;

ADCON0bits.CHS0=0;
ADCON0bits.CHS1=0;
ADCON0bits.CHS2=0;
ADCON0bits.CHS3=0;
ADCON0bits.ADON=0;
ADCON1 = 0x0f;
CMCON = 0x07;

TRISAbits.TRISA0 = 1; //RA0 Input (DI0)

TRISAbits.TRISA3 = 0; //RA3 Output (CS)
TRISAbits.TRISA4 = 0; //RA4 Output (DO0)

LATAbits.LATA3 = 0;
LATAbits.LATA4 = 0;

TRISBbits.TRISB4 = 0;
LATBbits.LATB4 = 1;

while(1)
{
if(aaaa==1)
{
LATAbits.LATA4 = 1;
}
}
}