1、定時(shí)器模塊1：輸出比較定時(shí)器延時(shí)，中斷點(diǎn)亮led燈#include <hidef.h> /* common defines and macros */#include <mc9s12db128.h> /* derivative information */void interrupt 8 aabreak(void); /此行可以注釋掉*unsigned int flag=0;void main(void) EnableInterrupts; TFLG1=0x01; /清中斷標(biāo)志位 DDRB=0xff; PORTB=0xff; /將B口定義為輸出，首先輸出全0 TSCR1

2、=0x80; /定時(shí)器使能，正常工作 TSCR2=0x01; /將定時(shí)器進(jìn)行128分頻 最高位不要開* TIE=0x01; /定時(shí)器0的中斷使能 TIOS=0x01; /將定時(shí)器設(shè)置為輸出比較狀態(tài) TCTL2=0x00; /定時(shí)器與引腳斷開 TFLG1=0x01; /清中斷標(biāo)志位 TC0=0x00f0; /給定時(shí)器賦值 for(;);#pragma CODE_SEG NON_BANKEDvoid interrupt 8 aabreak(void)/中斷號(hào)要正確，是中斷8 （從0通道開始算起的） TFLG1=0x01; /清中斷標(biāo)志位 if(flag=0) PORTB=0xaa; flag=1;

3、 else PORTB=0x55; flag=0; TC0=0x00f0; /給定時(shí)器賦值 2：輸入捕捉PORTA輸出脈沖，有定時(shí)器通道0對(duì)脈沖進(jìn)行計(jì)數(shù)，結(jié)果從PORTB輸出。#include <hidef.h> /* common defines and macros */#include <mc9s12db128.h> /* derivative information */unsigned int number=0; /脈沖計(jì)數(shù)初值為0/*初始化*/void init()EnableInterrupts; DDRA=0xff; /將A口定義為輸出，用于輸出脈沖DD

4、RB=0xff; /B口用于輸出脈沖值PORTB=0xff; /led燈全暗TIOS=0x00; /設(shè)置定時(shí)器通道0為輸入捕捉TSCR1=0x80; /定時(shí)器使能TSCR2=0x01; /設(shè)置自由計(jì)數(shù)器2分頻，且禁止定時(shí)器溢出中斷TCTL4=0x02; /捕捉器僅下降沿捕捉TIE=0x01; /允許定時(shí)器通道0的中斷TFLG1=0x01; /清除中斷標(biāo)志位/*用于產(chǎn)生脈沖*/void pulse() unsigned int i,j; PORTA=0xff; /將A口輸出高電平 for(i=0;i<10000;i+) for(j=0;j<100;j+) ; /延時(shí) PORTA=0x

5、00; /使A口輸出低電平 /*主函數(shù)*/void main(void) init(); for(;) pulse(); /*中斷子函數(shù)*/#pragma CODE_SEG NON_BANKEDvoid interrupt 8 count() TFLG1=0x01; /中斷標(biāo)志位清0number+; /計(jì)數(shù)值加1PORTB=(number); /B口輸出計(jì)數(shù)值模數(shù)轉(zhuǎn)換模塊（硬件未完成，以后補(bǔ)充。）PWM模塊#include <hidef.h> /* common defines and macros */#include <mc9s12db128.h> /* deriv

6、ative information */#pragma LINK_INFO DERIVATIVE "mc9s12db128b" void init() DDRB=0xff; /定義B口為輸出狀態(tài) PORTB=0x00; /led燈全部為暗 DDRA=0x00; /定義A口為接受狀態(tài) PWME=0x00; /首先禁止pwm輸出 PWMCTL=0x00; /PWM不級(jí)聯(lián) PWMPRCLK=0x77; /CLOCKA,CLOCKB分頻 PWMCLK=0xff; /都選擇CLOCKSA和CLOCKSB作為時(shí)鐘源 PWMSCLA=0xff; PWMSCLB=0xff; /再次分頻、

7、PWMPOL=0xff; /設(shè)置pwm周期開始為高電平 PWMCAE=0x00; /選擇左對(duì)齊方式 PWMPER0=0xfe; /選擇周期 PWMDTY0=0xfe; /占空比 PWME=0x01; /啟動(dòng)通道0的pwm輸出 void fun() if(PORTA_BIT5=1)PORTB=0x00; /如果此時(shí)pwm輸出高電平，則點(diǎn)亮led燈 else PORTB=0xff; /如果此時(shí)pwm輸出低電平，則熄滅led燈void main(void) DDRB=0xff;PORTB=0x00; for(;) fun(); SCI模塊#include <hidef.h> #inclu

8、de <mc9s12db128.h> #pragma LINK_INFO DERIVATIVE "mc9s12db128b"unsigned char pp=0xf0; /欲發(fā)送的數(shù)字/* 串口初始化*/void init() DDRB=0xff; PORTB=0xff; /開始led燈暗，即數(shù)據(jù)尚未接收 SCI0BD=52; /初始化波特率為9600 SCI0CR1=0x00; /八位無奇偶校驗(yàn)?zāi)Ｊ?SCI0CR2=0x2c; /接收中斷允許 /*寫數(shù)據(jù)*/void write(unsigned char n) SCI0SR1_TDRE=1; /數(shù)據(jù)傳輸?shù)捷敵?/p>

9、寄存器 SCI0DRL=n; while(SCI0SR1_TC=0); /等待發(fā)送完畢 /*讀數(shù)據(jù)*/unsigned char read() if(SCI0SR1_RDRF=1) /如果數(shù)據(jù)有效，那么將讀到的數(shù)據(jù)返回 return(SCI0DRL); /*主函數(shù)*/void main(void) EnableInterrupts; init(); write(pp); for(;); /等待中斷/*中斷子程序*/#pragma CODE_SEG NON_BANKEDvoid interrupt 20 funck() unsigned char k; k=read(); PORTB=k; SP

10、I模塊不會(huì)，以后補(bǔ)充。LED驅(qū)動(dòng)#include <hidef.h> /* common defines and macros */#include <mc9s12db128.h> /* derivative information */#pragma LINK_INFO DERIVATIVE "mc9s12db128b"unsigned char num4=0xC0,0xF9,0xF8,0xF9; / 四位顯示數(shù)字：0171unsigned char k,kk; /*初始化函數(shù)*/void init() DDRB=0xff; PORTB=0xff; DDRA=0xff; /將A,B口都定義為輸出模式 k=0; kk=0x01;/*延時(shí)程序*/void delay() unsigned int i; for(i=0;i<500;i+);/*顯示程序*/void show() PORTB