关于msp430f147的 MCLK,困惑了我一天。大家帮忙看一下(已解决)。
void main(void){
WDTCTL = WDTPW +WDTHOLD; // Stop Watchdog Timer
BCSCTL1 &= ~XT2OFF; //XT2 on
_BIS_SR(SCG0); //turn off DCO
BCSCTL2 |= SELM_2 + SELS; // MCLK = SMCLK = XT2
P5DIR |= 0x70; / P5.6,5,4 outputs
P5SEL |= 0x70; // P5.6,5,5 options
while(1)
{
}
}
示波器测量 MCLK、SMCLK, ACLK, 输出引脚,SMCLK为8MHz, ACLK为32.768KHz,都正常 但是MCLK始终是700KHz左右,不懂是为什么? 原来需要稳定一段时间:
void main(void)
{
WDTCTL = WDTPW +WDTHOLD; // Stop Watchdog Timer
BCSCTL1 &= ~XT2OFF; //XT2 on
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
_BIS_SR(SCG0); //turn off DCO
BCSCTL2 |= SELM_2 + SELS; // MCLK = SMCLK = XT2
P5DIR |= 0x70; / P5.6,5,4 outputs
P5SEL |= 0x70; // P5.6,5,5 options
while(1)
{
}
} 谢谢!!!
学习了!!!
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