STC12C5A60S2-两路PWM调制输出.zip_STC_STC12C5A60S pwm_properlywqr_stc12

/*------------------------------------------------------------------*/ /* --- STC MCU International Limited -------------------------------*/ /* --- STC 1T Series MCU Programme Demo ----------------------------*/ /* --- Fax: 86-755-82944243 ----------------------------------------*/ /* --- Tel: 86-755-82948412 ----------------------------------------*/ /* --- Web: www.STCMCU.com -----------------------------------------*/ /* If you want to use the program or the program referenced in the */ /* article, please specify in which data and procedures from STC */ /*------------------------------------------------------------------*/ /* 本程序经过测试完全正常, 不提供电话技术支持, 如不能理解, 请自行补充相关基础. */ /************* 本程序功能说明 ************** 两路PWM调制输出. **********************************************/ #include <reg51.h> #define uchar unsigned char #define uint unsigned int #define Timer0_Reload 18432 //T0 interrupt at 10ms @22.1184MHZ sfr AUXR = 0x8E; sfr CCON = 0xD8; sfr CMOD = 0xD9; sfr CCAPM0 = 0xDA; //PCA module 0 work mode sfr CCAPM1 = 0xDB; //PCA module 1 work mode sfr CL = 0xE9; //PCA counter sfr CCAP0L = 0xEA; //PCA模块0的捕捉/比较寄存器低8位。 sfr CCAP1L = 0xEB; //PCA模块1的捕捉/比较寄存器低8位。 sfr PCA_PWM0 = 0xF2; //PCA模块0 PWM寄存器。 sfr PCA_PWM1 = 0xF3; //PCA模块1 PWM寄存器。 sfr CH = 0xF9; sfr CCAP0H = 0xFA; //PCA模块0的捕捉/比较寄存器高8位。 sfr CCAP1H = 0xFB; //PCA模块1的捕捉/比较寄存器高8位。 sbit CCF0 = CCON^0; //PCA 模块0中断标志，由硬件置位，必须由软件清0。 sbit CCF1 = CCON^1; //PCA 模块1中断标志，由硬件置位，必须由软件清0。 sbit CR = CCON^6; //1: 允许PCA计数器计数，必须由软件清0。 sbit CF = CCON^7; //PCA计数器溢出（CH，CL由FFFFH变为0000H）标志。PCA计数器溢出后由硬件置位，必须由软件清0。 #define PWM0_NORMAL() PCA_PWM0 = 0 //PWM0正常输出(默认) #define PWM0_OUT_0() PCA_PWM0 = 3 //PWM0一直输出0 #define PWM1_NORMAL() PCA_PWM1 = 0 //PWM1正常输出(默认) #define PWM1_OUT_0() PCA_PWM1 = 3 //PWM1一直输出0 /************* 本地函数声明 **************/ void en_PCA(void); void en_PWM(uchar channel,uchar start_value); bit B_T0_interrupt; void main(void) { uint i; en_PWM(0,128); //load PWM value en_PWM(1,128); //load PWM value en_PCA(); //enable PCA EA = 1; //enable all interrupt while (1) { TMOD = 0x02; //T0 as 8 bit reload TH0 = 0 - 10; //Reload time AUXR |= 0x80; //T0 as 1T ET0 = 0; //disable T0 interrupt TR0 = 1; //enable T0 PWM0_NORMAL(); //PWM0 normal output PWM1_NORMAL(); //PWM1 normal output for(i=0; i<10000; i++) ; //delay for output PWM TR0 = 0; //disable T0 PWM0_OUT_0(); //PWM0 stop and putput 0 PWM1_OUT_0(); //PWM1 stop and putput 0 TMOD = 0x01; //T0 as 16bit timer TL0 = (0 - Timer0_Reload) % 256; //load the 16bit time TH0 = (0 - Timer0_Reload) / 256; AUXR &= ~0x80; //T0 as 12T ET0 = 1; //enable T0 interrupt TR0 = 1; //enable T0 B_T0_interrupt = 0; //clear the T0 interrupt flag while(!B_T0_interrupt); //wait the T0 interrupt TR0 = 0; //disable T0 } } /**********************************************/ void timer0 (void) interrupt 1 { B_T0_interrupt = 1; } //Note: CCAP0H and CCAP1H load the PWM output low time. void en_PCA(void) { CMOD = (CMOD & 0x81) + 4; //PCA clocj select Timer0 overfollow，Timer0 can select 1T mode or 12T through set AUXR. CL = 0x00; //clear PCA counter CH = 0x00; CR = 1; //Start PCA counter } void en_PWM(uchar channel,uchar start_value) { if(channel == 0) { CCAP0L = start_value; //Set the initial value same as CCAP0H CCAP0H = start_value; //25% Duty Cycle CCAPM0 = 0x42; //0x42 Setup PCA module 0 in PWM mode } if(channel == 1) { CCAP1L = start_value; //Set the initial value same as CCAP1H CCAP1H = start_value; //25% Duty Cycle CCAPM1 = 0x42; //0x42 Setup PCA module 1 in PWM mode } }