Problem mit AVR32 GPIO

#include <avr32/io.h>

void UsePLL(unsigned int clock)

{

  int clockh = (clock/6) - 1;

  AVR32_PM.oscctrl0 = (AVR32_PM.oscctrl0 | 0x00000407);        // Startup time  /  Oscillator Mode

  AVR32_PM.mcctrl =       AVR32_PM_OSC0EN_MASK;          // Enable Oscillator 0

  while((AVR32_PM.poscsr & AVR32_PM_POSCSR_OSC0RDY_MASK)== 0);  // Oscillator 0 is ready

  AVR32_PM.pll[0] =       0 << AVR32_PM_PLLOSC_OFFSET  |    // Oscillator 0 is the source for the PLL

                    1 << AVR32_PM_PLLDIV_OFFSET  |    // div = 1

                    clockh << AVR32_PM_PLLMUL_OFFSET |  // multi clock z.b. if clockh = 10 (10+1)*12=132/2Fvc = 66Mhz

                    5 << AVR32_PM_PLLOPT_OFFSET;      // 80MHz<fvco<180MHz / fPLL = fvco / Wide Bandwidth Mode disabled

  AVR32_PM.cksel =       0x80808080;

  AVR32_PM.pll[0] |=       AVR32_PM_PLLEN_MASK;            // PLL enable

  while(!(AVR32_PM.poscsr & AVR32_PM_POSCSR_LOCK0_MASK));      // PLL 0 is locked, and ready to be selected as clock source

  AVR32_FLASHC.fcr |=      0 << AVR32_FLASHC_FWS_OFFSET;      // The flash is read with 0 wait state. (write 1 otherwise)

  AVR32_PM.mcctrl |=       2 << AVR32_PM_MCSEL_OFFSET;        // PLL0 as main oscillator

}

int main()

{

  char c=0;

  UsePLL(24);

  AVR32_GPIO.port[1].gper = 0x00000fff; //Set Enable

  AVR32_GPIO.port[1].oder = 0x00000fff; //As Output

  AVR32_GPIO.port[1].ovrs = 0x00000001;

  while(1)

  {

    AVR32_GPIO.port[1].gperc = 0x00000001;

    c++;

    c++;

    AVR32_GPIO.port[1].gpers = 0x00000001;

  }

  return 0;

}