/*This program is used to make the CCP1 module generate a PWM waveform with a resolution of 10 bits and a duty cycle of 50%*/
#include "p18f458.h"
/* Initialization subroutine of CCP1 module's PWM mode*/
/* http://www.51hei.com provides this MCU program*/
void CCP1INIT()
{
CCPR1L=0X7F;
CCP1CON=0X3C; /* Set CCP1 module to PWM mode, and its working
cycle's lower 2 bits are 11, and the upper 8 bits are 01111111=7F*/
INTCON=0X00; /* Disable general interrupt and peripheral interrupt*/
PR2=0XFF; /* Set PWM working cycle*/
TRISC=0XFB; /* Set CCP1 pin to output mode*/
}
/*Main program*/
main()
{
CCP1INIT(); /*Initialize the PWM mode of CCP1 module*/
T2CON=0X04; /*Turn on TMR2 and set its pre-division frequency to 0,
*and start outputting PWM waveform*/
do
{
;
}while(1); /*The system starts outputting PWM waveform. If the system is
*multitasking, other tasks can be executed here
without affecting the generation of PWM waveform*/
}
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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