[讨论]

常用xs128超频代码

2014-3-11 21:57:53 2633

0 #include /* common defines and macros / #include / derivative information / #pragma LINK_INFO DERIVATIVE "mc9s12xs128" void delayms(int ms) { int ii,jj; if (ms<1) ms=1; for(ii=0;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= 2fOSC(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=0x80 \| 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=2osc(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=2osc(1+SYNR)/(1+REFDV)=64MHz; REFDV=0x80 \| 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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(1+SYNR)/(1+REFDV)=96MHz; _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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(1+SYNR)/(1+REFDV)=128MHz; _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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(1+SYNR)/(1+REFDV)=160MHz; _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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(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=0x80 \| 0x01; POSTDIV=0x00; //pllclock=2osc(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(500); // 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 */ } 0
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