msp430g2553上用定时器输出两路频率、占空比可调的方波

官网例程里没有两路的。一路pwm输出的好像也没有可调频率、占空比的。不过很简单的，下面例程调节CCR0和CCR1就能调整频率和占空比。一路会了，两路就简单了。 

//******************************************************************************
//  MSP430G2xx3 Demo - Timer_A, PWM TA1, Up/Down Mode, 32kHz ACLK
//
//  Description: This program generates one PWM output on P1.2 using
//  Timer_A configured for up/down mode. The value in CCR0, 128, defines the
//  PWM period/2 and the value in CCR1 the PWM duty cycle. Using
//  32kHz ACLK as TACLK, the timer period is 7.8ms with a 75% duty cycle on
//  P1.2. Normal operating mode is LPM3.
//  ACLK = TACLK = LFXT1 = 32768Hz, MCLK = default DCO
//  //* External watch crystal installed on XIN XOUT is required for ACLK *//	
//
//               MSP430G2xx3
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |         P1.2/TA1|--> CCR1 - 75% PWM
//
//  D. Dang
//  Texas Instruments, Inc
//  December 2010
//   Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************

#include <msp430.h>

int 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
  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_register(LPM3_bits);             // Enter LPM3
}