MSP430:PWM产生

#define PWM BIT6

// Description: This program generates one PWM output on P1.2 or P1.6 using
// Timer_A configured for up mode. The value in CCR0, 25-1, defines the PWM
// period and the value in CCR1 the PWM duty cycles.
// A 50% duty cycle on P1.6.
// ACLK = na, SMCLK = MCLK = TACLK = default DCO
void PWM_Init(void)
{
P1DIR |= PWM; // P1.2 and P1.3 output
P1SEL |= PWM; // P1.2 and P1.3 TA1/2 options
CCR0 = 25-1; // PWM Period
CCTL1 = OUTMOD_7; // CCR1 reset/set
CCR1 = 12; // CCR1 PWM duty cycle
TACTL = TASSEL_2 + MC_1; // SMCLK, up mode
}