Microchip dspic33ep PWM

int main(int argc, char** argv) {

/* Configure Oscillator to operate the device at 40Mhz

     Fosc= Fin*M/(N1*N2), Fcy=Fosc/2

      Fosc= 7.37*(43)/(2*2)=80Mhz for Fosc, Fcy = 40Mhz */

  /* Configure PLL prescaler, PLL postscaler, PLL divisor */

  PLLFBD=41;         /* M = PLLFBD + 2 */

  CLKDIVbits.PLLPOST=0;   /* N1 = 2 */

  CLKDIVbits.PLLPRE=0;    /* N2 = 2 */

    __builtin_write_OSCCONH(0x01);      /* New Oscillator FRC w/ PLL */

    __builtin_write_OSCCONL(0x01);      /* Enable Switch */

  while(OSCCONbits.COSC != 0b001);    /* Wait for new Oscillator to become FRC w/ PLL */  

    while(OSCCONbits.LOCK != 1);      /* Wait for Pll to Lock */

  /* Now setup the ADC and PWM clock for 120MHz

     ((FRC * 16) / APSTSCLR ) = (7.37 * 16) / 1 = ~ 120MHz*/

  ACLKCONbits.FRCSEL = 1;          /* FRC provides input for Auxiliary PLL (x16) */

  ACLKCONbits.SELACLK = 1;        /* Auxiliary Oscillator provides clock source for PWM & ADC */

  ACLKCONbits.APSTSCLR = 7;        /* Divide Auxiliary clock by 1 */

  ACLKCONbits.ENAPLL = 1;          /* Enable Auxiliary PLL */

  while(ACLKCONbits.APLLCK != 1);      /* Wait for Auxiliary PLL to Lock */

  PWMCON1bits.CAM = 0;

    PWMCON1bits.ITB = 0; 

    PTPER = 1204;

    PWMCON1bits.MDCS = 0;

    PDC1 = 800;

    PWMCON1bits.DTC = 0;

    DTR1 = 50;

    PHASE1= 0;

    IOCON1bits.PMOD = 3; 

    IOCON1bits.PENH = 1;

    IOCON1bits.PENL = 1;

    IOCON1bits.POLH = 0;

    IOCON1bits.POLL = 0;

    TRISA=0;

    LATA =0;

    PTCONbits.EIPU = 1;

    PTCONbits.PTEN = 1;

return(0);

}