Facing problem in Peripheral Timer0 pwmmode interrupt in ADSP 21489

Hello，

I want to configure a timer interrupt with the PWM mode of adsp21489, but no matter how I modify the value of pwmperiod, the time when it enters the interrupt remains unchanged. I don't know why. Can you answer my doubts? Below is my code and the instructions in the official hardware manual.

1.Below is my code（Time difference measured by clock function）：

//Peripheral Timer interrupt service routine

void timer_isr (int sig)
{
    *pTM0STAT = TIM0IRQ; //clear flagit

    EndTime = clock();
    printf("float operations cost:%u Cycles\n", (EndTime - StartTime));

    printf("timer0 interrupt!\n");
}

void main()
{

initPLL_SDRAM();
Init_SRU();

interrupts (SIG_P2, timer_isr);
Init_Timer0();

StartTime = clock();

while(1)
{；}
}

void Init_SRU()
{
SRU(HIGH,DPI_PBEN01_I);
SRU(TIMER0_O,DPI_PB01_I);

}

void Init_Timer0()
{
int TimEn;

*pTM0CTL=PULSE|IRQEN|PRDCNT|TIMODEPWM;


*pTM0PRD=0x1B7;


*pTM0W=0x112;


*pTM0CNT=0x1;

TimEn=*pTMSTAT;
TimEn |= TIM0EN;
*pTMSTAT=TimEn;
}

2.Below is the hardware manual：