msp430 PWM period calculation-EEWORLD

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example:

  P4DIR |= BIT1+BIT2+BIT3;                  // P4.1 - P4.3 output
  P4SEL |= BIT1+BIT2+BIT3;                  // P4.1 - P4.3 TBx options
  
  TBCCR0 = 512-1;                           // PWM Period
  TBCCTL1 = OUTMOD_7;                       // CCR1 reset/set
  TBCCR1 = LightCDPM;                       // CCR1 PWM duty cycle
  TBCCTL2 = OUTMOD_7;

In the up-counting mode, CCR0 is used for period timing, CCR1 is used for PWM duty cycle adjustment, TA1 -> PWM output:

512 (i.e. CCR0 value) X timer count clock = PWM period
128 (if it is CCR1 value) X timer count clock = PWM duty cycle

The actual PWM period is 512 clock cycles. Assuming that your timer B uses 8M clock, the actual PWM period = 512/8M = 64us

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