/**********************************************************/
//MSP430 Advanced Developping Components - [BaseComponents_41.C]
////USART0, UART 2400 Echo ISR, 32kHz ACLK
////->>> http://www.dutzm.cn
////->>> tel :(0)13130044096
/**********************************************************/
//MSP430高級實驗開發(fā)組件 - USART0,32KHz,2400
//時鐘設(shè)置:
////ACLK = UCLK0 = LFXT1 = 32768, MCLK = SMCLK = DCO~ 800k
////@2400 = 32768Hz/2400 = 13.65 (000Dh)
//當前演示程序功能描述:
////模擬接收端,在主循環(huán)中判斷標志位,將接收到的數(shù)據(jù)發(fā)送回去
/*********************************************************/

#include <msp430x14x.h>

void main(void) {
	WDTCTL = WDTPW + WDTHOLD;		//停止看門狗
	
	P3SEL |= (BIT4 + BIT5);			//P34,P35 USART0 TXD/RXD
	ME1 |= UTXE0 + URXE0;			//允許USART0 TXD/RXD
	UCTL0 |= CHAR;				//8-bit
	UTCTL0 |= SSEL0;			//UCLK = ACLK
	UBR00 = 0x0D;				//32768/2400 - 13.65
	UBR10 = 0x00;
	UMCTL0 = 0x6B;				//Modulation
	UCTL0 &= ~SWRST;			//初始化USART狀態(tài)機
	//IE1 |= URXIE0;				//允許USART0 RX中斷
	
	while(1) {
		_BIS_SR(LPM3_bits + GIE);	//進入LPM3低功耗模式,允許系統(tǒng)中斷
		while(!(IFG1&UTXIFG0));		//等待USART0 TX buffer準備好
		TXBUF0 = RXBUF0;		//RXBUF0 to TXBUF0
	}
}