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16F1825 internal 32Mhz

 
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picprogrammer



Joined: 10 Sep 2003
Posts: 35

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16F1825 internal 32Mhz
PostPosted: Fri Jan 20, 2012 11:48 am     Reply with quote

According the datasheet of the 16F1825 it must be possible to set the internal clock to 32mhz 4x8Mhz PLL
However
setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON,0);
Does not work, pll_on or off no difference. Always off.

Also #FUSES PLL no difference, the 4xPLL stays off in MPlab. When i override the configuration bits no change. So why is internal oscillator and PLL not possible?

In the datasheet: INTOSC – Internal oscillator (31 kHz to 32 MHz).
In figure FIGURE 5-1 shows 8Mhz can be routed to the 4xPLL
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Fri Jan 20, 2012 12:09 pm     Reply with quote

Always post your compiler version for a question of this type.
temtronic



Joined: 01 Jul 2010
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Location: Greensville,Ontario

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PostPosted: Fri Jan 20, 2012 12:51 pm     Reply with quote

Section 5.2.2.6 details how the various fuses have to be set to enable the 4XPLL with Internal Oscillator.

I suspect that the fuses are not being setup in the correct sequence but I don't have that chip to confirm what is actually programmed into one.
Tasark



Joined: 25 Jan 2011
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PostPosted: Sat Apr 13, 2013 5:10 pm     Reply with quote

Compiler 4.138

I've tried this as well and can only get 8mhz no matter what I try. I'm not sure how to set the FOSC bits that are described in the datasheet. Any help?
PCM programmer



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PostPosted: Sat Apr 13, 2013 6:49 pm     Reply with quote

Quote:
I've tried this as well and can only get 8mhz no matter what I try.

Post your test program. Preferably make it an LED blinking program:


Examples of short test programs for 32 MHz operation of PICs in
the 16F18xx series:

16F1823:
http://www.ccsinfo.com/forum/viewtopic.php?t=47854&start=4

16F1828:
http://www.ccsinfo.com/forum/viewtopic.php?t=47219&start=2
jgschmidt



Joined: 03 Dec 2008
Posts: 184
Location: Gresham, OR USA

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PostPosted: Sun Apr 14, 2013 9:56 am     Reply with quote

I'm currently using this family of processors. Here is my setup for 32MHz internal clock:

Code:
#include <16f1825.h>

#FUSES INTRC_IO       //Internal RC Osc, no output
#FUSES NOWDT          //No Watch Dog Timer
#FUSES NOPUT          //No Power Up Timer
#FUSES NOMCLR         //Engages weak pullup
#FUSES NOBROWNOUT     //No brownout reset

#use delay(internal=32M)


Cheers,
_________________
Jürgen
www.jgscraft.com
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