// MSP-FET430P140 Demo - Timer_A, Toggle P1.0, Overflow ISR, 32kHz ACLK
//
// Description: Toggle P1.0 using software and the Timer_A overflow ISR.
// In this example an ISR triggers when TA overflows. Inside the ISR P1.0
// is toggled. Toggle rate is exactly 0.5Hz. Proper use of the TAIV interrupt
// vector generator is demonstrated.
// 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 IAR Embedded Workbench Version: 3.21A
//******************************************************************************
#include <msp430x14x.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR |= 0x01; // P1.0 output
TACTL = TASSEL_1 + MC_2 + TAIE; // ACLK, contmode, interrupt
_BIS_SR(LPM3_bits + GIE); // Enter LPM3 w/ interrupt
}
// Timer_A3 Interrupt Vector (TAIV) handler
#pragma vector=TIMERA1_VECTOR
__interrupt void Timer_A(void)
{
switch( TAIV )//判断哪个产生中断
{
case 2: break; // CCR1 not used
case 4: break; // CCR2 not used
case 10: P1OUT ^= 0x01; // overflow
break;
}
} |
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