aduc7060 time 1定时中断进不去是为什么？如何处理？

#include"main.h"
void CpuInit(void);
//主程序
int main(void)
{
CpuInit();
while(1)
{
   ;
}
}
//单片机初始化
void CpuInit(void)
{
//设置内核时钟频率为最大 10.24MHz
  //定时器1初始化
T1LD  = 0x80;     // 32768 clock ticks
T1CON = 0xC0;  // Periodic mode, enable timer, 32768hz clock/1
IRQEN |= 0x10;
  PLLKEY1 = 0xAA; // Switch to external crystal
PLLCON = 0x02;
PLLKEY2 = 0x55;

POWKEY1 = 0x1;  
POWCON0 = 0x73;
POWKEY2 = 0xF4;
  //IO口配置
GP1DAT  = 0x60000000;  // Configure P1.6 P1.5 as an output
}
//中断向量
void IRQ_Handler(void)__irq
{
//定时器1中断
if(IRQSIG   0x00000010)
{
  GP1DAT ^= BIT22; // Toggle LED on Evaluation board (P1.6)
  T1CLRI = 0;  // Clear the currently active Timer0 Irq
}
}