例程代码你参考一下
#include <msp430x14x.h>
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P5DIR |= 0x10; // P5.4= output direction
P5SEL |= 0x10; // P5.4= MCLK option select
BCSCTL1 &= ~XT2OFF; // XT2= HF XTAL
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
BCSCTL2 |= SELM_2; // MCLK= XT2 (safe)
for (;;); // Do nothing
}
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