[LaunchPad] 时钟的初应用

 1 #include "io430g2553.h"
 2 
 3 void main(void)
 4 {
 5    volatile unsigned int i;
 6    
 7    WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
 8 
 9  //------------------------------------------
10  //ACLK = n/a , MCLK = DCO/8 , SMLK = DCO/8 
11 BCSCTL1=CALBC1_16MHZ ; //Setrange
12 DCOCTL=CALDCO_16MHZ; //设置DCO模式
13 BCSCTL2|=SELM_0 + DIVM_3 + DIVS_3;
14 
15 //-------------------------------------------
16 //ACLK = VLO , MCLK = VLO/8 , SMLK = VLO/8
17 /*
18 BCSCTL3 |= LFXT1S_2 ; //ACLK = VLO   
19 IFG1 &= ~OFIFG;
20 BCSCTL2|= SELM_3 + DIVM_3 + SELS + DIVS_3;
21 */
22 
23 
24 //__bis_SR_register(SCG1+SCG0); // 关闭 DCO
25 
26 
27   P1OUT |= 0xff; 
28   P1DIR |= 0xff;                            // Set P1.0 to output direction
29   
30   
31   P1DIR_bit.P3 = 0; 
32   P1REN_bit.P3 = 1;
33 
34   for (;;)
35   {
36    
37     if(P1IN_bit.P3)
38     {
39     P1OUT_bit.P6 = P1OUT_bit.P0;
40     P1OUT_bit.P0 = ~P1OUT_bit.P0;
41     }
42     
43     for(i=5000;i>0;i--);
44    
45   }
46 }

外接32kHz晶振,无法起振,不知是何情况

posted @ 2012-08-20 22:26  sky1991  阅读(372)  评论(0编辑  收藏  举报