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PLL with INTRC

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gjs_rsdi

Joined: 06 Feb 2006
Posts: 468
Location: Bali

PLL with INTRC

Posted: Mon Jan 30, 2017 6:36 pm

My email to CCS regarding PLL:

Quote:

CCS PCH C Compiler, Version 5.059, 31220
#device PIC18F26K22

#FUSES INTRC_IO
#FUSES PLLEN
#use delay(internal=32MHz)
The LST file Configuration Fuses:
Word 1: 2800 INTRC_IO NOPLLEN PRIMARY NOFCMEN NOIESO
Shows PLL not enabled but the controllers works at 32MHz, tested with a blinking LED

#FUSES ECM_IO
#FUSES PLLEN
#use delay(clock=32MHz)
The LST file configuration Fuses:
Word 1: 3B00 ECM_IO PLLEN PRIMARY NOFCMEN NOIESO
The controller works correct at 32MHz

CCS answer

Quote:

When you use #use delay(internal=xx) the compiler set the clock
related configuration fuses, in this case it's setting the INTRC_IO
and NOPLLEN fuses and then enables the PLL in software by setting
the PLLEN bit in the OSCTUNE register.
We do this so it's possible to switch to the 8 MHz and 16 MHz
internal oscillator in software using the setup_oscillator() function.

Just in case that somebody faces the same issue

Best wishes
Joe

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