求助：关于MSP430 6723波特率小数的问题，debug的寄存器和手册明显不一样

  P1SEL |= (BIT4 + BIT5);                                                       // P1.4,P1.5 = USCI_A1 RXD,TXD  
 // PMAP_CONTROL->PMAPKEYID = PMAPKEY;;                       
  P1MAP->P1MAP45 |=  ( PM_UCA1RXD| ((u16)PM_UCA1TXD <<8));
 // P1MAP->P1MAP45 |=  ( PM_UCA1TXD| ((u16)PM_UCA1RXD <<8));
//  PMAP_CONTROL->PMAPKEYID = 0;                                                  //用完记得Lock上
  
  P1DIR &= ~BIT4;P1REN |= BIT4;P1OUT |= BIT4;
  P1DIR |=  BIT5;P1DS  |= BIT5;P1OUT |= BIT5;
 // P1DS  |= (BIT4 + BIT5);
  UART1->CTLW0 |= UCSWRST;
  UART1->CTLW0 |= UCSSEL_1 ;
 // UART1->CTLW0 |= UCSSEL_1 |UCMODE0 |UCPEN | UCPAR ;                          //Dormant、ACLK、IDLE,，带偶检验
  UART1->BRW   = 32768/2400;                                                     //鸟玩意不能9600，4800也不稳定
  UART1->MCTLW  = 0x5300;
  UART1->CTLW0 &= ~UCSWRST;                                                     //关闭复位
  UART1->IE   |= UCRXIE;                                                        // Enable USCI_A1 RX interrupt