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1) USCIx分为USCI_Ax和USCI_Bx，其中只有USCI_Ax可配置为UART，MSP430单片机中有的型号有两个通信模块USCI0和USCI1。 USCI_A:支持UART, IrDA, SPI
USCI_B:支持I2C, SPI
2) 其他比较简单，设置好几个控制寄存器，波特率，写几个收发函数就可以了。
用到的配置图表，系统时钟1MHZ
比较关键的一个寄存器，程序里面通过UCA0MCTL设置
[cpp] view plain copy
- </pre><pre name="code" class="cpp"><pre name="code" class="cpp">void uart_Init() //初始化函数
- {
- //UCA0CTL1 |= UCSRST;
- UCA0CTL1 |= UCSSEL_2; //clock is BRCLK
- UCA0BR0 = 0x6D; //Baud N=BCLK/rate,rate=9600,BCLK=SMCLK=1M
- UCA0BR1 = 0;
- UCA0MCTL = UCBRS0; //UCBRSx=6
-
- P1DIR |= BIT2; //P1.2 ???UART_TX P1DIR|=0x01; P1OUT&=~0x01;
- P1DIR &= ~BIT1; //P1.2 UART_RX
- P1SEL = BIT1 + BIT2; //select P1.1 and P1.2 as UART port
- P1SEL2 = BIT1 + BIT2;
- UCA0CTL1 &=~UCSWRST; //**Initialize USCI state machine**
-
- //IE2 |= UCA0RXIE + UCA0TXIE; // interrupt
- IE2 |= UCA0RXIE; // interrupt
- }
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