[SOLVED] Configure PIC18F2550 Internal Clock

[denujith]

Hi,

Can someone of you please let me know how to configure internal clock of PIC18F2550 to 4MHz?

I am asking this since I am still not that confident with understanding datasheet and setting register bits. :sad:

/Lakmal

 

[spiralbrain]

this post is quite helpful: problem in crystal value
and also this file https://ww1.microchip.com/downloads/en/DeviceDoc/51537a.pdf

 

[denujith]

Thank you for your reply. I read those thread and document. But still have the same problem. Cannot understand what they discuss since I am not that capable of understanding such technical information since I just started with embedded systems and uControllers. I googled too. But could not find any helpful [for me] information.

 

[mrcube_ns]

You must select internal clock

than you must set:
IRCF2 = 1;
IRCF1 = 1;
IRCF0 = 0;

See:
https://ww1.microchip.com/downloads/en/devicedoc/39632c.pdf
page32

Mr.Cube

 

[denujith]

It worked!

#pragma config FOSC = INTOSC_EC
IRCF2 = 1; IRCF1 = 1; IRCF0 = 0;

Thank you all for your help (Y)