msp430f2274 PWM控制小程序

给你一个例程
//******************************************************************************
// MSP430F22x4 Demo - Timer_A, PWM TA1-2, Up Mode, DCO SMCLK
//
// Description: This program generates two PWM outputs on P1.2,3 using
// Timer_A configured for up mode. The value in TACCR0, 512-1, defines the PWM
// period and the values in TACCR1 and TACCR2 the PWM duty cycles.
// Using ~1.2MHz SMCLK as TACLK, the timer period is ~425us with
// a 75% duty cycle on P1.2 and 25% on P1.3.
// ACLK = n/a, 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