MC9S12XS128驅動LEDP10顯示屏

作者：時間：2016-11-27 來源：網(wǎng)絡

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void hangxuan(unsigned char P)

{

A=P&0x01;

B=(P>>1)&0x01;

C=(P>>2)&0X01;

D=(P>>3)&0X01;

CT=1;

}

void init()

{

DisableInterrupts;

SC=0;

CP=0;

A=0;

B=0;

C=0;

D=0;

RI=0;

CT=1;

DIR=0XFF;

EnableInterrupts;

}

void INIT_PLL(void)

{

CLKSEL &= 0x7f; //set OSCCLK as sysclk

PLLCTL &= 0x8F; //Disable PLL circuit

CRGINT &= 0xDF;

#if(BUS_CLOCK == 40000000)

SYNR = 0x44;

#elif(BUS_CLOCK == 32000000)

SYNR = 0x43;

#elif(BUS_CLOCK == 24000000)

SYNR = 0x42;

#endif

REFDV = 0x81; //PLLCLK=2×OSCCLK×(SYNDIV+1)/(REFDIV+1)＝64MHz ,fbus=32M

PLLCTL =PLLCTL|0x70; //Enable PLL circuit

asm NOP;

while(!(CRGFLG&0x08)); //PLLCLK is Locked already

CLKSEL |= 0x80; //set PLLCLK as sysclk

}

void timer_init()

{

//CLKSEL &= 0x7f; //set OSCCLK as sysclk

TSCR1_PRNT=0;//使能預分頻

TSCR2=0x87;//使能溢出中斷 128分頻

TCNTH=((unsigned int)(-20000))/256; //500ms

TCNTL=((unsigned int)(-20000))%6;

TFLG2_TOF=1; //清除溢出中斷標志位

TSCR1_TEN=1; //使能定時器

}

#pragma CODE_SEG __NEAR_SEG NON_BANKED

interrupt void timer()

{

TFLG2_TOF=1; //清除溢出中斷標志位

TCNTH=((unsigned int)(-20000))/256; //500ms

TCNTL=((unsigned int)(-20000))%6;

shu++;

if(shu==128)

{

shu=0;

}

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MC9S12XS128驅動LEDP10顯示屏

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