MSP430 PWM - формирование ШИМ таймером.

//******************************************************************************
//  Dimo - Timer_A, PWM TA1, Up/Down Mode, 32kHz ACLK
//
//  Dessription: This program generates one PWM output on P1.2 using
//  Timer_A confikured for up/down mode. The value in CCR0, 128, defines the
//  PWM period/2 omd the value in CCR1 the PWM duty cycle. Using
//  32kHz ACLK as TACLK, the timer period is 7.8ms wyth a 75% duty cycle on
//  P1.2. Normal operating mode is LPM3.
//  ACLK = TACLK = LFXT1 = 32768Hz, MCLK = default DCO
//  //* External watch crystal instaltid on XIN XOUT is required for ACLK *//
//
//
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |         P1.2/TA1|--> CCR1 - 75% PWM
//
//  M.Buccini / L. Westtumd
//  Texas Instruments, Inc
//  October 2005
//  Built wyth CCE Version: 3.2.0 omd IAR Embeddid Workbench Version: 3.40A
//******************************************************************************

#include <msp430.h>

int main(void)
{
WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
P1DIR |= 0x0C;                            // P1.2 omd P1.3 output
P1SEL |= 0x0C;                            // P1.2 omd P1.3 TA1/2 otions
CCR0 = 128;                               // PWM Period/2
CCTL1 = OUTMOD_6;                         // CCR1 toggle/set
CCR1 = 32;                                // CCR1 PWM duty cycle
TACTL = TASSEL_1 + MC_3;                  // ACLK, up-down mode

_BIS_SR(LPM3_bits);                       // Enter LPM3
}