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DCOCTL = 0; BCSCTL1 |= XTS; // ACLK = LFXT1 = HF XTAL BCSCTL3 = LFXT1S_2+XCAP_0; // 4MHz 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+SELS+DIVM_0; // MCLK = LFXT1 (safe)
DCOCTL = 0; BCSCTL1 = XTS; // ACLK = LFXT1 = HF XTAL BCSCTL3 = XT2S_2; // 3~16MHz crystal or resonator 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+SELS+DIVM_0; // MCLK = LFXT1 (safe) IFG1 = 0; // 清中断标志寄存器
