fet140_tb02.c

来自「msp430f14x 系列片内外设的实例代码」· C语言 代码 · 共 45 行

//******************************************************************************
//  MSP-FET430P140 Demo - Timer_B Toggle P1.0, CCR0 upmode ISR, DCO SMCLK 
//
//  Description; toggle P1.0 using software and TB_0 ISR. Timer_B is 
//  configured in upmode, thus the timer will overflow when TBR counts to TBCCR0.  
//  In this example, CCR0 is loaded with 20000. 
//  ACLK = n/a, MCLK = SMCLK = TBCLK= default DCO 
//
//           MSP430F149
//         ---------------
//     /|\|            XIN|-  
//      | |               |
//      --|RST        XOUT|-
//        |               |
//        |           P1.0|-->LED
//
//  M. Buccini
//  Texas Instruments, Inc
//  September 2003
//  Built with IAR Embedded Workbench Version: 1.26B
//  June 2004
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include <msp430x14x.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  P1DIR |= 0x01;                        // Set P1.0 to output direction
  TBCCTL0 = CCIE;                       // TBCCR0 interrupt enabled
  TBCCR0 = 20000;
  TBCTL = TBSSEL_2 + MC_1;              // SMCLK, upmode

  _BIS_SR(LPM0_bits + GIE);             // Enter LPM0 w/ interrupt
}

// Timer B0 interrupt service routine
#pragma vector=TIMERB0_VECTOR
__interrupt void Timer_B (void)
{
  P1OUT ^= 0x01;                        // Toggle P1.0 using exclusive-OR
}