怎样设置arm44b0的tick中断呢?

zhtao518

各位大侠,怎样设置arm44b0的tick中断呢?为什么我设置一秒中断之后不到一秒九中断了,以下是初始化的源程序pISR_TICK=(unsigned)time_tick;
ini_tick()
{rLCDCON1|=0x00000001;
rRTCCON = (unsigned char)1;
(*(volatile unsigned char *)0x1d7008c) = (unsigned char)(0x7f | 0x80);
rRTCCON = (unsigned char)0;
rI_ISPC = (unsigned int)0x01 << 20;
rINTMSK &= (unsigned int)~(0x01 << 20);
rINTMSK &= ~(0x03 << 26);
}