?? main.c
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///////////////////////////////////////////////////////////////////
// 16位累加器測速程序(PACB累加器),PT0口輸入脈沖
//每次記錄脈沖時間可修改宏:TIME_INTER
//author:whut_wj
///////////////////////////////////////////////////////////////////
#include <hidef.h> /* common defines and macros */
#include <mc9s12dg128.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"
#define TIME_INTER 1000 //1000個ms=1s
unsigned int Get_pulse;
void Start_PLL(void) //busCLK=32M
{
REFDV=0x01; // PLLCLK =2*OSCCLK*(SYNR + 1)/(REFDV + 1)
SYNR=0x03; // =2*16M*3/2=64M
asm{
BRCLR CRGFLG,#$08,*
BSET CLKSEL,#$80
}
}
void PACBInit()
{
TCTL4 = 0X02; //下降沿捕捉脈沖
PBCTL = 0x40; //級聯兩個8位累加器(PAC0和PAC1)
ICPAR = 0X03; //使能累加器
PACN10 = 0X0000;
}
void MDCInit(void)
{
MCCTL = MCCTL&0Xfb; //模數計數器禁止運行
MCCTL = 0Xe3; //允許中斷,模數計數方式
//返回時重新加載所用的常數,分頻常數為16
MCCTL = MCCTL|0X04; //模數計數器使能
MCCNT = 2000; //(1/32M)*16*2000= 1ms
MCCTL = MCCTL|0X08 ; //把模數常數寄存器的值加載到模數計數器FLMC;
}
void main(void)
{
DisableInterrupts;
Start_PLL();
PACBInit();
MDCInit();
EnableInterrupts;
for(;;)
{
}
}
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt 26 MDC_ISR(void)
{
static unsigned int number_count;
MCFLG = 0x80;
number_count ++;
if( number_count==TIME_INTER) //1秒取一次
{
number_count=0;
Get_pulse = PACN10;
PACN10 = 0X0000;
}
}
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