PWM setup for PIC16F873A

[junhao_wu]

Hi Guys! I have just programed my PWM code into PIC16F873A...was wondering if I just connect +5V to VDD, Ground my Vss, I should expect a square wave(PWM) at CCP1 pin?? or do i have to connect some circuity?

below is my C code.

#pragma chip PIC16F873A
#include "math24f.h"
void int_pwm(void)
{
int duty;
CCP1CON = 0;
TMR2 = 0;
TRISC.2 = 0;
PORTC.2 = 0;
PIE1.1 = 0;
PIE1.2 = 0;
PR2 = bin(00111110);
CCP1CON.5 = 0;
CCP1CON.4 = 0;
duty = bin(00011111);
CCPR1L = bin(00011111);
T2CON = bin(00000000);
CCP1CON = bin(00001100);
}
void main(void)
{
int_pwm();
T2CON.2 = 1;
while(1);
}

Pls kindly advise.... thank for inputs

 

[m.salehi]

hi.
please give me more details to help you better.

 

[junhao_wu]

Hi m.salehi, thanks for helping... I am trying to program a PWM with a period of frequency 16.7KHz, 50% duty cycle, portc CCP1 as output, prescaler of 1:1. Crystal is 4MHz. I have already program the code into the PIC16F873A. Now I wish to test out my PWM output. So what is the setup step??

1) Connect +5V to VDD
2) Connect Vss to ground
3) Using scope to see my PWM waveform with CCP1 pin.

Is that all i need to do see my PWM waveform??

Thanks