/************************************************************************
*函数原型： Timer_RA_Init
*功能 ： 初始化RA
************************************************************************/
void Timer_RA_Init(void)
{
 tstart_tracr = 0;     /* Stop Timer RA operation */
 while(tcstf_tracr != 0);
 traic = 0x00;      /* Disable Timer RA Interrupt */
 tstop_tracr = 1;     /* The TRAPRE and TRA registers are initialized */
/*****************************************************/
 /* Period between underflows : 40MHz  * 4 * 100 * 50 = 1ms */
 trapre = 100-1;      /* Set (100 - 1) in TRAPRE register */
 tra = 50-1;       /* Set (100 - 1) in TRA register */
/*****************************************************/
 tedgsel_traioc = 0;     /* Set to "0" in timer mode */
 topcr_traioc = 0;     /* Set to "0" in timer mode */
 //toena_traioc = 0;     /* Set to "0" in timer mode */
 tipf0_traioc = 0;     /* Set to "0" in timer mode */
 tipf1_traioc = 0;     /* Set to "0" in timer mode */
 tmod0_tramr = 0;     /* Set to "000" in timer mode */
 tmod1_tramr = 0;
 tmod2_tramr = 0;
 tck0_tramr = 0;              /* Select "fOCO" in Count Source */
 tck1_tramr = 1;
 tck2_tramr = 0;
 tckcut_tramr = 0;     /* Provides count source */
 traic=2;/*中断级别*/
 tstart_tracr = 1;     /* Start Timer RA operation */
 while(tcstf_tracr != 1);
}