芯片是用dsPIC33FJ256GP710.

CORE-E0004: Trap due to unimplemented FLASH memory access, occurred from instruction at 0x0004b2

这类是什么错误，要怎么样能消除？

附程序：
int main(void)
{
// Configure Oscillator to operate the device at 40Mhz
// Fosc= Fin*M/(N1*N2), Fcy=Fosc/2
// Fosc= 8M*40(2*2)=80Mhz for 8M input clock
PLLFBD=38; // M=40
CLKDIVbits.PLLPOST=0; // N1=2
CLKDIVbits.PLLPRE=0; // N2=2
OSCTUN=0; // Tune FRC oscillator, if FRC is used
RCONbits.SWDTEN=0; /* Disable Watch Dog Timer*/

while(OSCCONbits.LOCK!=1) {}; /* Wait for PLL to lock*/

IO_init();
UART2_init(); //////////////注释掉这条语句，程序就正常走，加了这个，就出问题，总在这儿发生一个，上面所示的错误
LCD_init();
line0_puts(mytext);
line1_puts("DEMO");
ADC_init();
PWM_init();
while(1)
{
if(_RE0 == 0)
{
DELAYMS(10);
if(_RE0 == 0){
line1_puts("SEND 'H'..");
}
}
}
}
/******************************************************************************/

void IO_init()
{
AD1PCFGL = 0xFFFF;
AD1PCFGH = 0xFFFF;
AD2PCFGL = 0xFFFF;
PORTE = 0x0000;
TRISE = 0xFF0F;
}

void UART2_init()
{
// configure U2MODE
U2MODE = 0;

U2BRG = 240; // 40Mhz osc, 9600 Baud

U2STA = 0;

IPC7 = 0x7700; // Mid Range Interrupt Priority level, no urgent reason

IFS1bits.U2TXIF = 0; // Clear the Transmit Interrupt Flag
IEC1bits.U2TXIE = 1; // Enable Transmit Interrupts
IFS1bits.U2RXIF = 0; // Clear the Recieve Interrupt Flag
IEC1bits.U2RXIE = 1; // Enable Recieve Interrupts

U2MODEbits.UARTEN = 1; // And turn the peripheral on

U2STAbits.UTXEN = 1;
// I think I have the thing working now.
}


请DX帮忙看看！谢谢

感谢，问题解决了，基于Timer2输出一组可变频的PWM，基于Timer3同时输出三路，频率不变的PWM。

问题如上，谢谢，
四路PWM同时输出，对应的时基怎么选？感谢回答
看了，文档里：
Each output compare channel can use one of two selectable time bases. Refer to the device data sheet for the time bases associated with the module.
不知如何解！