void main() { // Stop watchdog timer to prevent time out reset WDTCTL = WDTPW + WDTHOLD; BCSCTL3 |= LFXT1S_2; // Set LFXT1为vol时钟即12kHZ CCTL0|= CCIE; //设置捕获/比较控制寄存器，CCIE=0x0010，使能捕获比较中断