stc12c2052ad单片机pwm输出程序

stc12c2052ad单片机pwm输出程序

PWM0 3.7
PWM1 3.5
#include "reg51.h"
#include "intrins.h"

#define FOSC 18432000L

typedef unsigned char BYTE;
typedef unsigned int WORD;


sfr CCON = 0xD8; //PCA control register
sbit CCF0 = CCON^0; //PCA module-0 interrupt flag
sbit CCF1 = CCON^1; //PCA module-1 interrupt flag
sbit CR = CCON^6; //PCA timer run control bit
sbit CF = CCON^7; //PCA timer overflow flag
sfr CMOD = 0xD9; //PCA mode register
sfr CL = 0xE9; //PCA base timer LOW
sfr CH = 0xF9; //PCA base timer HIGH
sfr CCAPM0 = 0xDA; //PCA module-0 mode register
sfr CCAP0L = 0xEA; //PCA module-0 capture register LOW
sfr CCAP0H = 0xFA; //PCA module-0 capture register HIGH
sfr CCAPM1 = 0xDB; //PCA module-1 mode register
sfr CCAP1L = 0xEB; //PCA module-1 capture register LOW
sfr CCAP1H = 0xFB; //PCA module-1 capture register HIGH
sfr CCAPM2 = 0xDC; //PCA module-2 mode register
sfr CCAP2L = 0xEC; //PCA module-2 capture register LOW
sfr CCAP2H = 0xFC; //PCA module-2 capture register HIGH
sfr CCAPM3 = 0xDD; //PCA module-3 mode register
sfr CCAP3L = 0xED; //PCA module-3 capture register LOW
sfr CCAP3H = 0xFD; //PCA module-3 capture register HIGH
sfr PCAPWM0 = 0xF2;
sfr PCAPWM1 = 0xF3;
sfr PCAPWM2 = 0xF4;
sfr PCAPWM3 = 0xF5;

void main()
{
CCON = 0; //Initial PCA control register
//PCA timer stop running
//Clear CF flag
//Clear all module interrupt flag
CL = 0; //Reset PCA base timer
CH = 0;
CMOD = 0x02; //Set PCA timer clock source as Fosc/2
//Disable PCA timer overflow interrupt
CCAP0H = CCAP0L = 0x80; //PWM0 port output 50% duty cycle square wave
CCAPM0 = 0x42; //PCA module-0 work in 8-bit PWM mode and no PCA interrupt

CCAP1H = CCAP1L = 0xff; //PWM1 port output 0% duty cycle square wave
PCAPWM1 = 0x03;
CCAPM1 = 0x42; //PCA module-1 work in 8-bit PWM mode and no PCA interrupt

CR = 1; //PCA timer start run

while (1);
}