msp430x22x4_uscia0_uart_01_19200_2.c

MSP430F2274 单片机C程序调试代码

//******************************************************************************
//   MSP430F22x4 Demo - USCI_A0, UART 19200 Echo ISR, HF XTAL SMCLK
//
//   Description: This program will echo a received character, RX interrupt
//   service used. XT1 oscillator used in this example.
//   ACLK = MCLK = SMCLK = BRCLK = LFXT1CLK = 8MHz
//   Baud rate divider with 8MHz XTAL @19200 = 8MHz/19200 = ~416.6
//   //* An external 8MHz XTAL on XIN XOUT is required for LFXT1CLK *//
//
//                MSP430F22x4
//             -----------------
//         /|\|              XIN|-
//          | |                 | 8MHz
//          --|RST          XOUT|-
//            |                 |
//            |     P3.4/UCA0TXD|------------>
//            |                 | 19200 - 8N1
//            |     P3.5/UCA0RXD|<------------
//
//   A. Dannenberg
//   Texas Instruments Inc.
//   January 2007
//   Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include  "msp430x22x4.h"

volatile unsigned int i;

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

  BCSCTL1 |= XTS;                           // ACLK = LFXT1 = HF XTAL
  BCSCTL3 |= LFXT1S1;                       // 3