3、实例
- void MCU_Init(void)
- {
- WDTCTL = WDTPW+WDTHOLD; // Stop WDT
- P11DIR |= 0x07; // ACLK, MCLK, SMCLK set out to pins
- P11SEL |= 0x07; // P11.0,1,2 for debugging purposes.
- __bis_SR_register(SCG0); // Disable the FLL control loop +OSCOFF
-
- // Initialize LFXT1 ,XT2
- P5SEL |= 0x0C; // Port select XT2
- P7SEL |= 0x03; // Port select XT1
- UCSCTL6 &= ~(XT1OFF + XT2OFF); // Set XT1 & XT2 On
- UCSCTL6 |= XCAP_3; // Internal load cap
-
- // Loop until XT1,XT2 & DCO fault flag is cleared
- do
- {
- UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);
- // Clear XT2,XT1,DCO fault flags
- SFRIFG1 &= ~OFIFG; // Clear fault flags
- }while (SFRIFG1&OFIFG); // Test oscillator fault flag
-
- UCSCTL6 &= ~XT2DRIVE1; // Decrease XT2 Drive according to
- // expected frequency
- UCSCTL5 |= DIVS_1; // SMCLK/2=8Mhz
- UCSCTL4 |= SELS_5 + SELM_5; // SMCLK=MCLK=XT2=16Mhz
- }
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