//*******************************************************************************
//  MSP430x47xx Demo - Timer_B, PWM TB1-2 Up Mode, 32kHz ACLK
//
//  Description: This program outputs two PWM signals on P2.2 & P2.3 using
//  Timer_B configured for up mode. The value in CCR0 defines the PWM period
//  and the values in CCR1 and CCR2 the PWM duty cycles. Using 32kHz ACLK as
//  TBCLK, the timer period is 15.6ms. Normal operating mode is LPM3.
//  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
//  //* An external watch crystal between XIN & XOUT is required for ACLK *// 
//
//              MSP430x47xx
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |         P2.2/TB1|--> CCR1 - 75% PWM
//           |         P2.3/TB2|--> CCR2 - 25% PWM
//
//  P. Thanigai / K.Venkat
//  Texas Instruments Inc.
//  November 2007
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A
//*****************************************************************************
#include  <msp430x47x4.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  FLL_CTL0 |= XCAP18PF;                     // Set load capacitance for xtal  
  P2DIR |= BIT2+BIT3;                            // P2.2 - P2.3 output
  P2SEL |= BIT2+BIT3;                            // P2.3 - P2.3 TBx options
  TBCCR0 = 512-1;                           // PWM Period
  TBCCTL1 = OUTMOD_7;                       // CCR1 reset/set
  TBCCR1 = 384;                             // CCR1 PWM duty cycle
  TBCCTL2 = OUTMOD_7;
  TBCCR2 = 128;

  TBCTL = TBSSEL_1 + MC_1;                  // ACLK, up mode
  _BIS_SR(LPM3_bits);                       // Enter LPM3
}