main.c

MC9S08DZ60AD SAMPLE可以完整调试 有详细说明

#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */

void MCGInit (void) {
   //if (ExtClkFlg == 1) { /* If using a 4 MHz crystal */
       if (SRS_LOC == 0)  {   /* If no loss of clock has occurred, enter PEE to generate 16 MHz bus */
           /* FEI -> FBE Mode */ 
           MCGC2 = 0x36;      /* BDIV by 1, xtal freq RANGE high, High GAIN, EREFS set */
           MCGC1 = 0xB8;      /* RDIV by 128 down to 31.25 kHz for FLL, Switch to ext. ref  */
           while (MCGSC_IREFST);       /* Check internal ref. no longer on */
           MCGC3 = 0xA0;      /* LOL interrupt, LOC reset (CME) enabled (ONLY after IREFS = 0)  */  
           while (!MCGSC_OSCINIT);     /* Wait until crystal initializes */
           while (MCGSC_CLKST != 0b10);/* Check external ref. switched */
       
           /* FBE -> PBE */ 
           MCGC3 = 0xE8;      /* Set PLLS bit with VDIV mult by 32 */  
           MCGC1 = 0x90;      /* RDIV by 4 (4 MHz/4 = 1 MHz for PLL) */ 
           while (!MCGSC_PLLST);
           while (!MCGSC_LOCK);  

           /* PBE -> PEE */
           MCGC1 =  0x10;     /* CLKS changed to [0:0] - PLL output = 32 MHz clock, 16 MHz bus */
           while (MCGSC_CLKST != 0b11);
       }

   }
 
   ////AD初始化///////////////////////////////////////
void InitAD(void) 
{
  ADCCFG=0x00;//8位AD采集，使用系统时钟 
  ADCSC2=0x00;
  APCTL1=0x00;//AD0-7作为模拟信号输入
}
  

 int ad2;
void main(void) 
{ 

//关中断 
  DisableInterrupts;
  
  SRS = 0x55; /* Clear WatchDog counter */ 
  SRS = 0xAA;
  
  SOPT1=0x00; 
  SPMSC2 = 0x00;    /* LVD lvl=4.0V , LVW lvl=4.3V */
  SPMSC1 = 0x00;    /* LVD resets, LVD enabled in STOP, BG buffer enabled */ 
  
    MCGInit();        /* Initialize MCG 时钟频率为16M*/
    InitAD();
  
   PTBDD=0xff;
 
  EnableInterrupts; 

while(1){   

     ADCSC1=0x22; //AD中断禁止，从通道2采集,连续采集
    while(ADCSC1_COCO==0){;}//查询AD转换标志位，没有则等待
    
    ad2=ADCRL;//将AD采来的值赋给ad2
    
    if(ad2>100)
     PTBD_PTBD7=1;
     else PTBD_PTBD7=0;
}
}