编译器提示IDATA 溢出

求解，在使用time3 PWM输出时，编译器debug时一直提示idata溢出

寄存器设置时，赋值有错误吗？

寄存器配置应该不会有问题，代码如下：

/* Setup TIMER3 PWM at alternate location 2 */
PERCFG |= 0x20; // TIME3 at location 2
P1SEL |= 0x40; // Peripheral function on TIMER3 (P1_6 P1_7)
P2SEL |= 0x20; // Give priority to TIMER3 over USART 1 for P1_6 P1_7 pins.

//set the time ticks to 32M , CLKCONCMD[5:3]
CLKCONCMD &= ~0x08;
CLKCONCMD &= ~0x10;
CLKCONCMD &= ~0x20;
//set the Prescaler divider to 128
T3CTL |= 0x80;
T3CTL |= 0x40;
T3CTL |= 0x20;

//set the timer3 mode
T3CTL |= 0x03; //up/down

//set the time3 channel0 mode
T3CCTL0 |= 0x04; //compare mode

T3CCTL0 |= 0x20; //clear output on compare_up,set on 0
T3CCTL0 &= ~0x10;
T3CCTL0 &= ~0x08;

//clear counter
T3CTL |= 0x04;

//set the compare value
T3CC0 = 0x40;

//set the interrupt
T3CTL |= 0x08; //overflow interrupt mask
T3CCTL0 |= 0x40; //channel 0 interrupt mask

IEN0 |= 0x80; //enable interrupt
IEN1 |= 0x08; //timer3 interrupt enable

// //start the pwm
T3CTL |= 0x10;

还有如果我在上面的代码后面加while（1）pwm波形输出正常，但是去掉while（1）后，系统跑起来后看波形根本没按设定的速率输出，一点规律没有