pic 18f25k22 new pic to play with

[peterc]

Hi all and a happy new year


I have always used external xtal's with my projects but would like to make a very simple tacho for my lathe and would like to keep the component count to the minimum! but can anyone help with coding for setting this pic up using its internal Osc?

Hi, its great to see you visiting our forum. Why not try Proton Compiler for FREE? Download the FREE version of Proton Compiler, Its called Amicus18 and its available from HERE Already using proton Compiler??? Get rid of these pesky messages... get LICENSED USER STATUS

Thanks for any guidance you can spare

Peter

[hadv215]

Hi Peter,
I did this for a 18F26K22, but they're in the same datasheet so it should be OK!

Config_Start
ieso = off
fosc = intio67
Config_End
(Of course there's more here, but I just show the oscillator stuff)

; oscillator control
Symbol IRCF2 OSCCON.6
Symbol IRCF1 OSCCON.5
Symbol IRCF0 OSCCON.4
; 16MHz
IRCF2 = 1
IRCF1 = 1
IRCF0 = 1
; osctune = 0

Note that bits 0 and 1 of OSCCON are 0 by default so the osc directive from the Config is used.
It's all in the datasheet (Register 2.1 and ) but, as often, you'll have to know where have to start looking and how to 'read' it.
Please take a look at Register 2.3...you can even use the PLL with INTOSC (but only if it's running at 8 or 16 MHz) so you can have 32 MHz or even a massive 64 MHz.
Look at Chapter 24>Register 24.1 for the various choices for the oscillator (note that you'll have to use the description MPASM understands...it's not always obvious so take a look at the the file MPASM Suite\P18F25K22.inc).

As you may know you can use osctune to tune your specific oscillator. I found I did not have to do that with mine, but you're never sure...

Greetz,
Harm

[peterc]

Hi Harm

Thanks for the code I will give a go tomorrow on the breadboard

Peter