msp430x22x4_ta_19.c

MSP430F2274 单片机C程序调试代码

//******************************************************************************
//  MSP430F22x4 Demo - Timer_A, PWM TA1-2, Up/Down Mode, DCO SMCLK
//
//  Description: This program generates two PWM outputs on P1.2,3 using
//  Timer_A configured for up/down mode. The value in TACCR0, 128, defines the
//  PWM period/2 and the values in TACCR1 and TACCR2 the PWM duty cycles. Using
//  ~1.2MHz SMCLK as TACLK, the timer period is ~212us with a 75% duty cycle
//  on P1.2 and 25% on P1.3.
//  SMCLK = MCLK = TACLK = default DCO ~1.2MHz
//
//               MSP430F22x4
//            -----------------
//        /|\|              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//           |         P1.2/TA1|--> TACCR1 - 75% PWM
//           |         P1.3/TA2|--> TACCR2 - 25% PWM
//
//  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 |= 0x0C;                            // P1.2 and P1.3 output
  P1SEL |= 0x0C;                            // P1.2 and P1.3 TA1/2 otions
  TACCR0 = 128;                             // PWM Period/2
  TACCTL1 = OUTMOD_6;                       // TACCR1 toggle/set
  TACCR1 = 32;                              // TACCR1 PWM duty cycle
  TACCTL2 = OUTMOD_6;                       // TACCR2 toggle/set
  TACCR2 = 96;                              // TACCR2 PWM duty cycle
  TACTL = TASSEL_2 + MC_3;                  // SMCLK, up-down mode

  __bis_SR_register(LPM0_bits);             // Enter LPM0
}