Hi,

I have a strange issue,

1 .DBGU init below works fine when MCK - 100352000 and PCK -200704000 , pUSART->US_BRGR = 54
2. but for my project I need to set PCK to 133120000 so as MCK 66560000, pUSART->US_BRGR = 36. With these settings characters on hyperterminal are wrong.

DBGU Init code -
unsigned int dwMasterClock;
AT91PS_USART pUSART = (AT91PS_USART) AT91C_BASE_DBGU;
AT91PS_PDC pPDC = (AT91PS_PDC) &(pUSART->US_RPR);
AT91PS_PIO pPioB = (AT91PS_PIO) AT91C_BASE_PIOB;

dwMasterClock = mck;

//
// Init the DBGU
//
// Configure PIO controllers to periph mode
pPioB->PIO_ASR = AT91C_PB14_DRXD | AT91C_PB15_DTXD ;
pPioB->PIO_PDR = AT91C_PB14_DRXD | AT91C_PB15_DTXD ;


//Configure USART
// Disable interrupts
pUSART->US_IDR = (unsigned int) -1;

// Reset receiver and transmitter
pUSART->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RXDIS | AT91C_US_TXDIS ;

// Define the baud rate divisor register
{
unsigned int baud_value = ((dwMasterClock*10)/(baudrate * 16));
if ((baud_value % 10) >= 5)
baud_value = (baud_value / 10) + 1;
else
baud_value /= 10;
pUSART->US_BRGR = baud_value;
}

// Write the Timeguard Register
pUSART->US_TTGR = 0;

// Clear Transmit and Receive Counters

// Disable the RX and TX PDC transfer requests
pPDC->PDC_PTCR = AT91C_PDC_RXTDIS;
pPDC->PDC_PTCR = AT91C_PDC_TXTDIS;

// Reset all Counter register Next buffer first
pPDC->PDC_TNPR = 0;
pPDC->PDC_TNCR = 0;
pPDC->PDC_RPR = 0;
pPDC->PDC_RCR = 0;
pPDC->PDC_RPR = 0;
pPDC->PDC_RCR = 0;
pPDC->PDC_TPR = 0;
pPDC->PDC_TCR = 0;

// Enable the RX and TX PDC transfer requests
pPDC->PDC_PTCR = AT91C_PDC_RXTEN;
pPDC->PDC_PTCR = AT91C_PDC_TXTEN;

// Define the USART mode
pUSART->US_MR = AT91C_US_ASYNC_MODE;

// Enable Transmitter
pUSART->US_CR = AT91C_US_RXEN;
pUSART->US_CR = AT91C_US_TXEN;


Any clue to solve the issue will be very helpful. Thanks in advance.