MSP430F2418串口接收异常

你好

在进行MSP430F2418串口接收时，接收300字节。会随机出现中间少一个字节，

下面是串口初始化：

UCA0CTL1 |= UCSWRST;
UCA0CTL1 |= UCSSEL_2; ////SMCLK

UCA0BR0= 0X22;
UCA0BR1 = 0x00; 
UCA0MCTL = 0x00;

UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
UCA0ABCTL |= UCABDEN;
P3SEL |= 0X30;
UC0IE |= UCA0RXIE;