Helio,
This bit of initialization code has been implemented and works provided
you have a crystal properly connected to the device. One obvious
deficiency of this code is that if the external HF oscillator never
starts the code will hang waiting for it. I believe this was discussed
in a previous post and improvements could be made to correct.
Brian Ott
/*********************************************************************************
unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
BCSCTL1 |= XTS; // ACLK =
LFXT1 = HF XTAL (0x40)
do
{
IFG1 &= ~OFIFG; // Clear OSCFault
flag
for (i = 0xFF; i > 0; i--); // Time for flag
to set
}
while ((IFG1 & OFIFG) == OFIFG); // OSCFault flag still set?
BCSCTL2 |= SELM1+SELM0; // MCLK = LFXT1
(safe)(0x40+0x80=0xC0)
UCTL0 = CHAR; // 8-bit character
UTCTL0 = SSEL0; // UCLK = ACLK
UBR00 = 0x74; // 3.58Mhz/9600 -
372
UBR10 = 0x01; //
UMCTL0 = 0x00; // no modulation
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
IE1 |= URXIE0; // Enable USART0 RX
interrupt
P3SEL |= 0x30; // P3.4,5 = USART0
TXD/RXD
P3DIR |= 0x10; // P3.4 output
direction
_EINT(); // Enable interrupts
/*********************************************************************************
/*********************************************************************************
