//****************************************************************************** // MSP430F22x4 Demo - Timer_A, Toggle P1.0, TACCR0 Up Mode ISR, DCO SMCLK // // Description: Toggle P1.0 using software and TA_0 ISR. Timer_A is // configured for up mode, thus the timer overflows when TAR counts to // TACCR0. In this example, TACCR0 is loaded with 20000. // ACLK = n/a, MCLK = SMCLK = TACLK = default DCO ~1.2MHz // // MSP430F22x4 // ----------------- // /|\| XIN|- // | | | // --|RST XOUT|- // | | // | P1.0|-->LED // // A. Dannenberg // Texas Instruments Inc. // April 2006 // Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A //****************************************************************************** #include "msp430x22x4.h" void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop WDT P1DIR |= 0x01; // P1.0 output TACCTL0 = CCIE; // TACCR0 interrupt enabled TACCR0 = 20000; TACTL = TASSEL_2 + MC_1; // SMCLK, upmode __bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupt } // Timer A0 interrupt service routine #pragma vector=TIMERA0_VECTOR __interrupt void Timer_A (void) { P1OUT ^= 0x01; // Toggle P1.0 }