MC9S12XS128驱动LEDP10显示屏
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;
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;//使能预分频
TSCR2=0x87;//使能溢出中断
128分频
TCNTH=((unsigned int)(-20000))/256; //500ms
评论