STC12C5A60S2内部PWM应用

【PWM】.实例一:电路图如上，该程序的功能是利用按键S1对LED的亮度进行调节。

程序如下：#include"STC12C5A.h"//注意这个头文件，用reg52是不行的，如果你没有的话，可以去百// //度文档里搜索“STC12C5A系列单片机头文件”，有我共享的头文件。

void delay(unsigned int cnt){unsigned char i;for(;cnt>0;cnt--)for(i=0;i<250;i++);}void main(){CCON=0; //PCA初始化CL=0; //PCA的16位计数器低八位CH=0; //PCA的16位计数器高八位CMOD=0x00; //选择系统时钟/12 为计数脉冲,则PWM的频率f=sysclk/256/12;CCAP0H=0x80; // 占空比控制CCAP0L=0x80;PCA_PWM0=0x00; //控制占空比的第九位为0CCAPM0=0x42; //允许P13作为PWM输出CR=1; //启动PCA计数器while(1){if(P10==0){delay(200);while(P10==0);CCAP0H+=10; //占空比调节CCAP0L+=10;}}}实例二：两个文件main.c#include <REG51.H>#include <intrins.h>#define U8 unsigned char#define U16 unsigned intvoid DelayMs(U8 ms);void PWM_clock(U8 clock);void PWM_start(U8 module,U8 mode);////////////////////// 延时子程序/////////////////////////////void DelayMs(U8 ms) //在11.0592M晶振下，stc10f系列（单周期指令）的ms级延时{U16 i;while(ms--){for(i = 0; i < 850; i++);}}////////////////////主函数入口////////////////////////////sfr CCON = 0xD8; //PCA控制寄存器sfr CMOD = 0xD9; //PCA模式寄存器sfr CCAPM0 = 0xDA; //PCA模块0模式寄存器//模块0对应P1.3/CEX0/PCA0/PWM0(STC12C5A60S2系列)sfr CCAPM1 = 0xDB; //PCA模块1模式寄存器//模块1对应P1.4/CEX1/PCA1/PWM1(STC12C5A60S2系列)sfr CL = 0xE9; //PCA 定时寄存器低位sfr CH = 0xF9; //PCA 定时寄存器高位sfr CCAP0L = 0xEA; //PCA模块0的捕获寄存器低位sfr CCAP0H = 0xFA; //PCA模块0的捕获寄存器高位sfr CCAP1L = 0xEB; //PCA模块1的捕获寄存器低位sfr CCAP1H = 0xFB; //PCA模块1的捕获寄存器高位sfr PCA_PWM0 = 0xF2; //PCA PWM 模式辅助寄存器0sfr PCA_PWM1 = 0xF3; //PCA PWM 模式辅助寄存器1sbit CF = 0xDF; //PCA计数溢出标志位sbit CR = 0xDE; //PCA计数器运行控制位sbit CCF1 = 0xD9; //PCA模块1中断标志sbit CCF0 = 0xD8; //PCA模块0中断标志//* CCAPOH = CCAPOL = 0XC0; //模块0输出占空因数为25%//* CCAPOH = CCAPOL = 0X80; //模块0输出占空因数为50%//* CCAPOH = CCAPOL = 0X40; //模块0输出占空因数为75%void PWM_clock(U8 clock);void PWM_start(U8 module,U8 mode);void PWM_clock(U8 clock){CMOD |= (clock<<1);CL = 0x00;CH = 0x00;}void PWM_start(U8 module,U8 mode){CCAP0L = 0XC0;CCAP0H = 0XC0; //模块0初始输出占空因数为25%CCAP1L = 0XC0;CCAP1H = 0XC0; //模块1初始输出占空因数为25%if(module==0){switch(mode){case 0: CCAPM0 = 0X42;break; //模块0设置为8位PWM输出，无中断case 1: CCAPM0 = 0X53;break; //模块0设置为8位PWM输出，下降沿产生中断case 2: CCAPM0 = 0X63;break; //模块0设置为8位PWM输出，上升沿产生中断case 3: CCAPM0 = 0X73;break; //模块0设置为8位PWM 输出，跳变沿产生中断default: break;}}elseif(module==1){switch(mode){case 0: CCAPM1 = 0X42;break; //模块1设置为8位PWM输出，无中断case 1: CCAPM1 = 0X53;break; //模块1设置为8位PWM输出，下降沿产生中断case 2: CCAPM1 = 0X63;break; //模块1设置为8位PWM输出，上升沿产生中断case 3: CCAPM1 = 0X73;break; //模块1设置为8位PWM输出，跳变沿产生中断default: break;}}elseif(module==2){switch(mode){case 0: CCAPM0 = CCAPM1 = 0X42;break; //模块0和1设置为8位PWM输出，无中断case 1: CCAPM0 = CCAPM1 = 0X53;break; //模块0和1设置为8位PWM输出，下降沿产生中断case 2: CCAPM0 = CCAPM1 = 0X63;break; //模块0和1设置为8位PWM输出，上升沿产生中断case 3: CCAPM0 = CCAPM1 = 0X73;break; //模块0和1设置为8位PWM输出，跳变沿产生中断default: break;}}CR=1; //PCA计数器开始计数}void PCA_Intrrpt(void) interrupt 7{if(CCF0) CCF0=0;if(CCF1) CCF1=0; //软件清零if(CF) CF=0; //软件清零}void main(){TMOD|=0x02; /* timer 0 mode 2: 8-Bit reload */TH0=0xff;TR0=1;PWM_clock(2); // PCA/PWM时钟源为定时器0的溢出PWM_start(0,0); // 模块0,设置为PWM输出,无中断,初始占空因素为25%while(1){DelayMs(250);}}PwmDrive_12C5A.c#include <intrins.h>#define U8 unsigned charsfr CCON = 0xD8; //PCA控制寄存器sfr CMOD = 0xD9; //PCA模式寄存器sfr CCAPM0 = 0xDA; //PCA模块0模式寄存器//模块0对应P1.3/CEX0/PCA0/PWM0(STC12C5A60S2系列)sfr CCAPM1 = 0xDB; //PCA模块1模式寄存器//模块1对应P1.4/CEX1/PCA1/PWM1(STC12C5A60S2系列)sfr CL = 0xE9; //PCA 定时寄存器低位sfr CH = 0xF9; //PCA 定时寄存器高位sfr CCAP0L = 0xEA; //PCA模块0的捕获寄存器低位sfr CCAP0H = 0xFA; //PCA模块0的捕获寄存器高位sfr CCAP1L = 0xEB; //PCA模块1的捕获寄存器低位sfr CCAP1H = 0xFB; //PCA模块1的捕获寄存器高位sfr PCA_PWM0 = 0xF2; //PCA PWM 模式辅助寄存器0sfr PCA_PWM1 = 0xF3; //PCA PWM 模式辅助寄存器1sbit CF = 0xDF; //PCA计数溢出标志位sbit CR = 0xDE; //PCA计数器运行控制位sbit CCF1 = 0xD9; //PCA模块1中断标志sbit CCF0 = 0xD8; //PCA模块0中断标志//* CCAPOH = CCAPOL = 0XC0; //模块0输出占空因数为25%//* CCAPOH = CCAPOL = 0X80; //模块0输出占空因数为50%//* CCAPOH = CCAPOL = 0X40; //模块0输出占空因数为75%void PWM_clock(U8 clock);void PWM_start(U8 module,U8 mode);void PWM_clock(U8 clock){CMOD |= (clock<<1);CL = 0x00;CH = 0x00;}void PWM_start(U8 module,U8 mode){CCAP0L = 0XC0;CCAP0H = 0XC0; //模块0初始输出占空因数为25%CCAP1L = 0XC0;CCAP1H = 0XC0; //模块1初始输出占空因数为25%if(module==0){switch(mode){case 0: CCAPM0 = 0X42;break; //模块0设置为8位PWM输出，无中断case 1: CCAPM0 = 0X53;break; //模块0设置为8位PWM输出，下降沿产生中断case 2: CCAPM0 = 0X63;break; //模块0设置为8位PWM输出，上升沿产生中断case 3: CCAPM0 = 0X73;break; //模块0设置为8位PWM输出，跳变沿产生中断default: break;}}elseif(module==1){switch(mode){case 0: CCAPM1 = 0X42;break; //模块1设置为8位PWM输出，无中断case 1: CCAPM1 = 0X53;break; //模块1设置为8位PWM输出，下降沿产生中断case 2: CCAPM1 = 0X63;break; //模块1设置为8位PWM输出，上升沿产生中断case 3: CCAPM1 = 0X73;break; //模块1设置为8位PWM输出，跳变沿产生中断default: break;}}elseif(module==2){switch(mode){case 0: CCAPM0 = CCAPM1 = 0X42;break; //模块0和1设置为8位PWM输出，无中断case 1: CCAPM0 = CCAPM1 = 0X53;break; //模块0和1设置为8位PWM输出，下降沿产生中断case 2: CCAPM0 = CCAPM1 = 0X63;break; //模块0和1设置为8位PWM输出，上升沿产生中断case 3: CCAPM0 = CCAPM1 = 0X73;break; //模块0和1设置为8位PWM输出，跳变沿产生中断default: break;}}CR=1; //PCA计数器开始计数}void PCA_Intrrpt(void) interrupt 7{if(CCF0) CCF0=0;if(CCF1) CCF1=0; //软件清零if(CF) CF=0; //软件清零}。