//******************************************************************************
//  MSP430F20xx Demo - Timer_A, PWM TA1, Up Mode, 32kHz ACLK
//
//  Description: This program generates one PWM output on P1.2 using
//  Timer_A configured for up mode. The value in CCR0, 512-1, defines the PWM
//  period and the value in CCR1 the PWM duty cycles. Using 32kHz ACLK
//  as TACLK, the timer period is 15.6ms with a 75% duty cycle on P1.2.
//  Normal operating mode is LPM3.
//  ACLK = TACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO.
//  //* External watch crystal installed on XIN XOUT is required for ACLK *// 
//
//               MSP430F20xx
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |         P1.2/TA1|--> CCR1 - 75% PWM
//
//  M.Buccini / L. Westlund
//  Texas Instruments, Inc
//  October 2005
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.40A
//******************************************************************************

#include  <msp430x20x3.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 options
  CCR0 = 512-1;                             // PWM Period
  CCTL1 = OUTMOD_7;                         // CCR1 reset/set
  CCR1 = 384;                               // CCR1 PWM duty cycle
  TACTL = TASSEL_1 + MC_1;                  // ACLK, up mode

  _BIS_SR(LPM3_bits);                       // Enter LPM3
}