1、PWMio利用PXVM實(shí)現(xiàn)D1功能的典型應(yīng)用線路圖P?”匚二 Ir*?3|ZZ RSI 匚 2二 KxD £ 3匚二 iiPdL 1P0.0A= 3XTAL2IZZ aKIAL1ILXK ;P3J 匚二 3PI A-ACOJPI 5'ADCSK1P1.1-.DU1PI.3DC3?0 1 IC4T1F3 JF02P12MDCHVDaKairTfi； rcTTC.?3 4CLKOIHI rNlTLP35E2.1?2 3vssPI tyADCI PLO-'ATCOF2.7104Zp10KT>AP2.S04豐實(shí)例一:電路圖如上，該程序的功能是利用按鍵S1對(duì)LED的亮度進(jìn)

2、行調(diào)節(jié)。程序如下：#includeH12c5A” 注意這個(gè)頭文件，用reg52是不行的，如果你沒(méi)有的話，可以去百/度文檔里搜索“ STC12c5A系列單片機(jī)頭文件”，有我共享的頭文件void delay(u nsig ned int ent) (un sig ned char i;for(;c nt>O;c nt-)for(i=0;i<250;i+);)void mai n()CCON=0; /PCA 初始化CL=0; /PCA的16位計(jì)數(shù)器低八位CH=0; /PCA的16位計(jì)數(shù)器高八位CMOD=OxOO; 選擇 系統(tǒng)時(shí)鐘/12 為計(jì)數(shù)脈沖，貝ij PWM 勺頻率 f=sysclk

3、/256/12; CCAP0H=0x80; /占空比控制CCAP0L=0x80;PCA_PWM0=0x00; 控制占空比的第九位為0CCAPM0=0x42; 允許 P13 作為 PWM 輸出CR=1; 啟動(dòng)PCA計(jì)數(shù)器while(1)if(P10=0) delay(200); while(P10=0);CCAP0H+=10; 占空比調(diào)節(jié) CCAP0L+=10;實(shí)例二：兩個(gè)文件#include <>#include <> #define 1)8 unsigned char#define U16 unsigned intvoid DelayMs(U8 ms);void PW

4、M_clock(U8 clock);void PWM_start(U8 module,U8 mode);llllllllllllllllllllll 延時(shí)子程序 lllllllllllllllllllllllllllllvoid DelayMs(U8 ms) / 在11.0592M晶振下，stclOf系列(單周期指令)的ms級(jí)延時(shí)U16i;while(ms-)(for(i = 0; i < 850; i+);llllllllllllllllllll)主函數(shù)入口 llllllllllllllllllllllllllllsfr CCON=0xD8; /PCAsfr CMOD sfrrr AD

5、h/insfrsfr CL =0xD9; /PCA=OxDA; /PCA=OxDB; /PCA 0xE9;/PCAsfr CH = 0xF9; /PCAsfr CCAPOL = OxEA; /PCAsfr CCAPOH = OxFA; /PCA控制寄存器模式寄存器模塊0模式寄存器 模塊。對(duì)應(yīng)CEX°/PCA°/PWM°（STC12c5A60S系歹q）模塊1模式寄存器 模塊1對(duì)應(yīng)CEX1/PCA1/PWM1（STC12c5A60s系歹D 定時(shí)寄存器低位定時(shí)寄存器高位模塊0的捕獲寄存器低位模塊0的捕獲寄存器高位sfr CCAP1L = 0xEB;/PCAsfr CCA

6、P1H = 0xFB;/PCA模塊1的捕獲寄存器低位模塊1的捕獲寄存器高位sfr PCA_PWM0 = 0xF2; /PCA PWM 模式輔助寄存器 0sfr PCA_PWM1 = 0xF3; /PCA PWM 模式輔助寄存器 1 sbit CF = OxDF; /PCA sbitCR = OxDE;/PCAsbit CCF1 = 0xD9; /PCA sbit CCFO = 0xD8; /PCA/* CCAPOH = CCAPOL = OXCO; / /* CCAPOH = CCAPOL = 0X80; / 計(jì)數(shù)溢出標(biāo)志位計(jì)數(shù)器運(yùn)行控制位 模塊1中斷標(biāo)志模塊0中斷標(biāo)志模塊0輸出占空因數(shù)為25

7、%模塊0輸出占空因數(shù)為50%/* CCAPOH = CCAPOL = 0X40;/ 模塊 0 輸出占空因數(shù)為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)CCAPOL = 0XC0;CCAPOH = 0XC0;/模塊0初始輸出CCAP1L = 0XC0;CCAP1H = 0XC0; /模塊1初始輸出 if(modu

8、le=0)switch(mode)(case 0: CCAPM0 = 0X42;break; / case 1: CCAPMO = 0X53;break; / case 2: CCAPMO = 0X63;break; / default: break;)elseif(module=1)switch(mode)(=0X42;break; / case 1: CCAPM1 = 0X53;break; / case 2: CCAPM1 = 0X63;break; / case 3: CCAPM1 = 0X73;break; / case 0: CCAPM1 default: break;占空因數(shù)為2

9、5%占空因數(shù)為25%case 3: CCAPMO = 0X73;break; /8位PWM輸出，無(wú)中斷模塊0設(shè)置為8位PWM輸出，下降沿產(chǎn)生中斷模塊0設(shè)置為8位PWM輸出，上升沿產(chǎn)生中斷 模塊0設(shè)置為&位PWM輸出，跳變沿產(chǎn)生中斷 模塊°設(shè)置為模塊1設(shè)置為8位PWM輸出，無(wú)中斷模塊1設(shè)置為8位PWM輸出，下降沿產(chǎn)生中斷模塊1設(shè)置為8位PWM輸出，上升沿產(chǎn)生中斷模塊1設(shè)置為8位PWM輸出，跳變沿產(chǎn)生中斷elseif(module=2)(switch(mode)(case 0: CCAPMO = CCAPM1=0X42;break; /case 1: CCAPMO = CCAPM

10、1 = 0X53;break; /case 2: CCAPMO = CCAPM1 = 0X63;break; /模塊0和1設(shè)置為模塊0和1設(shè)置為模塊0和1設(shè)置為8位PWM輸出，無(wú)中斷8位PWM輸出，下降沿產(chǎn)生中斷8位PWM輸出，上升沿產(chǎn)生中斷case 3: CCAPMO = CCAPM1 = 0X73;break; / default: break;)CR=1;PCA計(jì)數(shù)器開(kāi)始計(jì)數(shù))void PCA_lntrrpt(void) interrupt 7模塊0和1設(shè)置為8位PWM輸出，跳變沿產(chǎn)生中斷if(CCFO) CCF0=0;if(CCF1) CCF1=0;/ 軟件清零 if(CF) CF=0

11、; / 軟件清零)void main()(TMOD|=0x02; /* timer 0 mode 2: 8-Bit reload */ THO=Oxff;TR0=1;PWM_clock; PCA/PWM時(shí)鐘源為 定時(shí)器0的溢出PWM_start(OQ);模塊0,設(shè)置為PWM輸出，無(wú)中斷，初始占空因素為25% while。)(DelayMs(250);)12C5A#include <> #define L)8 unsigned charsfr CCON = OxD8;/PCA控制寄存器sfr CMOD = 0xD9; /PCA sfr CCAPMO = OxDA; /PCAsfr C

12、CAPM1 = OxDB; /PCAsfrCL = 0xE9;/PCAsfr CH = 0xF9; /PCAsfr CCAPOL = OxEA; /PCA sfr CCAPOH = OxFA; /PCA sfr CCAP1L =OxEB;/PCAsfr CCAP1H = OxFB; /PCA模式寄存器模塊。模式寄存器模塊°對(duì)應(yīng)CEX°/PCA°/PWM°（STC12c5A60S系歹IJ）模塊1模式寄存器模塊1對(duì)應(yīng)CEX1/PCA1/PWM1（STC12c5A60s系歹I）定時(shí)寄存器低位定時(shí)寄存器高位模塊0的捕獲寄存器 低位模塊0的捕獲寄存器模塊高位低位模

13、塊1聃懶需襦 高位sfr PCA_PWM0 = 0xF2; /PCA PWM 模式輔助寄存器 模sfr PCA_PWM1 = 0xF3;/PCA PWM式輔助寄存器sbit CF = OxDF; /PCA sbitCR = OxDE;/PCA模塊0輸出占空因數(shù)為75%sbit CCF1 = 0xD9; /PCA sbit CCFO = 0xD8; /PCA/* CCAPOH = CCAPOL = OXCO; / /* CCAPOH = CCAPOL = 0X80;/ /* CCAPOH = CCAPOL = 0X40; / 計(jì)數(shù)溢出標(biāo)志位計(jì)數(shù)器運(yùn)行控制位模塊1中斷標(biāo)志模塊0中斷標(biāo)志模塊0輸出占

14、空因數(shù)為25%模塊0輸出占空因數(shù)為50%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) CCAPOL = 0XC0;CCAPOH = 0XC0; /模塊0初始輸出 占空因數(shù)為25%CCAP1L = 0XC0;CCAP1H = 0XC0; 模塊1初始輸出占空因數(shù)為25% if(module=0)switch(mode)cas

15、e 0: CCAPM0 = 0X42;break; / case 1: CCAPMO = 0X53;break; / case 2: CCAPMO = 0X63;break; / case 3: CCAPMO = 0X73;break; / default: break;)elseif(module=1)(switch(mode)模塊0設(shè)置為8位PWM輸出，無(wú)中斷模塊0設(shè)置為8位PWM輸出，下降沿產(chǎn)生中斷模塊0設(shè)置為8位PWM輸出，上升沿產(chǎn)生中斷模塊0設(shè)置為8位PWM輸出，跳變沿產(chǎn)生中斷case 0: CCAPM1 = 0X42;break; / case 1: CCAPM1 = 0X53;b

16、reak; / case 2: CCAPM1 = 0X63;break; / case 3: CCAPM1 = 0X73;break; / default:模塊1設(shè)置為8位PWM輸出，無(wú)中斷模塊1設(shè)置為8位PWM輸出，下降沿產(chǎn)生中斷模塊1設(shè)置為8位PWM輸出，上升沿產(chǎn)生中斷模塊1設(shè)置為8位PWM輸出，跳變沿產(chǎn)生中斷break;) )elseif(module=2) switch(modecase 0: CCAPMO = CCAPM1 = 0X42;break;/case 1: CCAPMO = CCAPM1 = 0X53;break; / case 2: CCAPMO = CCAPM1 = 0X63;break