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发表于 2016-4-27 08:41:51
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给你贴个官方例程
//******************************************************************************
// MSP-FET430P140 Demo - Timer_A, Toggle P1.0, CCR0 Up Mode ISR, 32kHz ACLK
//
// Description: Toggle P1.0 using software and the TA_0 ISR. Timer_A is
// configured for up mode, thus the timer overflows when TAR counts
// to CCR0. In this example, CCR0 is loaded with 1000-1.
// Toggle rate = 32768/(2*1000) = 16.384
// ACLK = TACLK = 32768Hz, MCLK = SMCLK = default DCO ~800kHz
// //* An external watch crystal on XIN XOUT is required for ACLK *//
//
// MSP430F149
// ---------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// | P1.0|-->LED
//
// M. Buccini
// Texas Instruments Inc.
// Feb 2005
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.21A
//******************************************************************************
#include <msp430x14x.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR |= 0x01; // P1.0 output
CCTL0 = CCIE; // CCR0 interrupt enabled
CCR0 = 1000-1;
TACTL = TASSEL_1 + MC_1; // ACLK, upmode
_BIS_SR(LPM3_bits + GIE); // Enter LPM3 w/ interrupt
}
// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
P1OUT ^= 0x01; // Toggle P1.0
}
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