pic18f4550 pwm rc2 change to rc3

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david43

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Hi all,
How to change the pwm to rc3 or other place??
now it is using the rc2.
i find PSTRCON to change the port
but it not work and can't build it.
i find pic 18f4550 datasheet but seem not have PSTRCON register

PHP: 
#include <pic18.h>       
__CONFIG(1,HS&CPUDIV1) ;  
__CONFIG(2,WDTDIS) ;     
__CONFIG(3,PBADDIS) ;     
__CONFIG(4,XINSTDIS) ;   
unsigned char pwmbuf;
void main(void)
{	
	OSCCON=0X00;    		
	ADCON1=0X0f;            
  	TRISC=0B00000000;   
	PORTC=0B00000000;      
	CCP1CON=0xc;	       
	PR2=63;              
	T2CKPS1=0;
	T2CKPS0=0;           	
	TMR2ON=1;	         	
	//PSTRCON=0b00000100;
	pwmbuf=0;              

	CCPR1L=pwmbuf;          
  	while(1)
  	{ 		   		
   		
   			pwmbuf++;	    
			CCPR1L=pwmbuf;	
if(pwmbuf==100)
pwmbuf=0;
   		}    	
  	}
}
 
Last edited:

My reading of the datasheet is this:

There is no RC3 pin.

PWM output can be on RC1, RC2 or RB3 (the pins marked CCP1 or CCP2). I see no other options.
 

hexreader said:
My reading of the datasheet is this:

There is no RC3 pin.

PWM output can be on RC1, RC2 or RB3 (the pins marked CCP1 or CCP2). I see no other options.
Click to expand...
how to change to RB3?
i need 3 pwm port to 3 control motor
thank you
 

david43 said:
how to change to RB3?
i need 3 pwm port to 3 control motor
thank you
Click to expand...
There are only 2 CCP modules in this PIC, so only two hardware PWM outputs are possible.

I have heard talk of software PWM, but know nothing about it.

Maybe the simple solution is to change to another PIC that has more CCPs
 

If you require 3 PWM outputs, use CCP1 and CCP2 for 2 PWM outputs and generate the third using software PWM using, for example, Timer 1.

There are PICs with 3 (or more) hardware CCP modules. One example is PIC16F777.
 

Tahmid said:
If you require 3 PWM outputs, use CCP1 and CCP2 for 2 PWM outputs and generate the third using software PWM using, for example, Timer 1.

There are PICs with 3 (or more) hardware CCP modules. One example is PIC16F777.
Click to expand...

Do you have any source code about using timer1 to generate the pwm?
thank you
 

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