/************************************************************************
*函数原型： Timer_RB_Init
*功能 ： 初始化RB
************************************************************************/
void Timer_RB_Init(void)
{
 tstart_trbcr = 0;     /* Stop Timer RB operation */
 while(tcstf_trbcr != 0);
 trbic = 0x00;      /* Disable Timer RB Interrupt */
 tstop_trbcr = 1;     /* The TRBPRE and TRBPR registers are initialized */
          /* The TSTART and TCSTF bits in the TRBCR register are initialized too. */
/****************************************************************/
 /* Period between underflows : 20MHz * f2 * 200 * 50 = 1ms */
 trbpre = 200-1;      /* Set (200 - 1) in TRBPRE register */
 trbpr = 125-1;      /* Set (50 - 1) in TRBPR register */
/****************************************************************/
 topl_trbioc = 0;     /* Set to "0" in timer mode */
 tocnt_trbioc = 0;     /* Set to "0" in timer mode */
 inostg_trbioc = 0;     /* Set to "0" in timer mode */
 inoseg_trbioc = 0;     /* Set to "0" in timer mode */
 tmod0_trbmr = 0;     /* Set to "00" in timer mode */
 tmod1_trbmr = 0;
 twrc_trbmr = 0;      /* Write to reload register and counter */
 tck0_trbmr = 1;                     /* Select "f2" in Count Source */
 tck1_trbmr = 1;
 tckcut_trbmr = 0;     /* Provides count source */
 trbic=1;              /*中断级别*/
 tstart_trbcr = 1;     /* Start Timer RB operation */
 while(tcstf_trbcr != 1);
}