The output of MSP430G2231 38KHZ 1% duty cycle?

For PWM wave, the frequency = clock source/CCR0, duty cycle = CCR1/CCR0. For example, to output 38KHZ 1% duty cycle PWM with 8MHz SMCLK source, then CCR0= 8000/38=211, CCR1 = 21.  Please see below code example for reference.

#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

     //8Mhz
     if (CALBC1_8MHZ==0xFF) // If calibration constants erased
     {
          while(1); // do not load, trap CPU!!
     }
     DCOCTL = 0; // Select lowest DCOx and MODx settings
     BCSCTL1 = CALBC1_8MHZ; // Set range
     DCOCTL = CALDCO_8MHZ; // Set DCO step + modulation 

  P1DIR |= 0x0C;                            // P1.2 and P1.3 output
  P1SEL |= 0x0C;                            // P1.2 and P1.3 TA1/2 otions
  CCR0 = 211;                               // PWM Period/2
  CCTL1 = OUTMOD_6;                         // CCR1 toggle/set
  CCR1 = 21;                                // CCR1 PWM duty cycle
  TACTL = TASSEL_2 + MC_3;                  // SMCLK, up-down mode

  __bis_SR_register(LPM3_bits);             // Enter LPM3
}

 B.R

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