时钟测试源代码.txt

来自「Code Warrior 4.7 Target : MC9S12XS128 」· 文本 代码 · 共 176 行

#include <hidef.h>      /* common defines and macros */
#include <MC9S12XS128.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12xs128"

void delayms(int ms)
{   
   int ii,jj;
   if (ms<1) ms=1;
   for(ii=0;ii<ms;ii++)
     for(jj=0;jj<3338;jj++);    //40MHz--1ms      
}
void SetBusCLK_16M(void)
{   
    CLKSEL=0X00;				// disengage PLL to system
    PLLCTL_PLLON=1;			// turn on PLL
    SYNR=0x00 | 0x01; 	// VCOFRQ[7:6];SYNDIV[5:0]
                        // fVCO= 2*fOSC*(SYNDIV + 1)/(REFDIV + 1)
                        // fPLL= fVCO/(2 × POSTDIV) 
                        // fBUS= fPLL/2 
                        // VCOCLK Frequency Ranges  VCOFRQ[7:6]
                        // 32MHz <= fVCO <= 48MHz    00
                        // 48MHz <  fVCO <= 80MHz    01
                        // Reserved                  10
                        // 80MHz <  fVCO <= 120MHz   11				
    REFDV=0xc0 | 0x01;  // REFFRQ[7:6];REFDIV[5:0]
                        // fREF=fOSC/(REFDIV + 1)
                        // REFCLK Frequency Ranges  REFFRQ[7:6]
                        // 1MHz <= fREF <=  2MHz       00
                        // 2MHz <  fREF <=  6MHz       01
                        // 6MHz <  fREF <= 12MHz       10
                        // fREF >  12MHz               11                         
                        // pllclock=2*osc*(1+SYNR)/(1+REFDV)=32MHz;
    POSTDIV=0x00;       // 4:0, fPLL= fVCO/(2xPOSTDIV)
                        // If POSTDIV = $00 then fPLL is identical to fVCO (divide by one).
    _asm(nop);          // BUS CLOCK=16M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_32M(void)
{   
    CLKSEL=0X00;				// disengage PLL to system
    PLLCTL_PLLON=1;			// turn on PLL
    SYNR =0x40 | 0x03;  // pllclock=2*osc*(1+SYNR)/(1+REFDV)=64MHz;                      
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;  
    _asm(nop);          // BUS CLOCK=32M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_40M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x04;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=80MHz;
    _asm(nop);          //BUS CLOCK=40M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_48M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x05;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=80MHz;
    _asm(nop);          //BUS CLOCK=48M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_64M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x07;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=80MHz;
    _asm(nop);          //BUS CLOCK=64M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_80M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x09;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=80MHz;
    _asm(nop);          //BUS CLOCK=80M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_88M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x0a;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=176MHz;
    _asm(nop);          //BUS CLOCK=88M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_96M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x0b;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=192MHz;
    _asm(nop);          //BUS CLOCK=96M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_104M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x0c;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=208MHz;
    _asm(nop);          //BUS CLOCK=104M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void SetBusCLK_120M(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR =0xc0 | 0x0d;                        
    REFDV=0xc0 | 0x01; 
    POSTDIV=0x00;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=240MHz;
    _asm(nop);          //BUS CLOCK=120M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
void main(void) {
  /* put your own code here */
  unsigned char LedCnt=0;
  
  SetBusCLK_96M();    // 此处选择待设定的总线频率
  DDRB=0xff;
  DDRA=0x01;
  PORTA=0XFE;
  PORTB=0XFE;
  
  EnableInterrupts;

  for(;;) {   
  
    LedCnt=(LedCnt>0XFE?0:++LedCnt);
    delayms(2000);   // 修改延时以修改数据发送频率
    
    //低电平灯亮用这句,注释掉下面那句 
    PORTB=~LedCnt;         // 测试清华版系统板
    PORTA_PA0=~PORTA_PA0;  // 测试龙丘最小系统板
    //PORTB_BIT7=~PORTB_BIT7;
    //高电平灯亮用这句,注释掉上面那句   
    //PORTB=LedCnt;  
  
  } /* wait forever */
  /* please make sure that you never leave this function */
}