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Configuration bits modification on CCS

 
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SAMIR_SBG



Joined: 01 Nov 2007
Posts: 9

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Configuration bits modification on CCS
PostPosted: Tue Jun 30, 2009 10:07 am     Reply with quote

Hi,
I work with PIC18F14K50.
I use CCS Compiler v4.088.

There are many bugs in the compiler to set the clock frequency.

When I use the command:

#FUSES HS
#use delay (clock=20MHz)



--> I found that the really operating frequency is 5 MHz not 20MHz
When I verify with MPLab Simulator I found that:

CONFIG1L = 0x38 --> CPU Divider is set to 4
--> USB Divider is se to 2

To work with 20MHz I must use

#FUSES HS
#FUSES CPUDIV1
#use delay (clock=20MHz)

When I use the command:

#fuses H4
#use delay (clock=48M, oscillator=12M)



No thing work and I found many errors in the CONFIG1L CONFIG1H

To work with 48MHz I must use

#fuses H4
#FUSES CPUDIV1
#FUSES USBDIV1
#FUSES PLLEN
#use delay (clock=48M, oscillator=12M)

But only CPUDIV1 and USBDIV1 was changed

The #FUSES PLLEN don't make any change
So I must change it directly in the end of generated HEX file:

From
:0E00000000C61E1E0008890003C003E0034076
To
:0E00000000D21E1E0008890003C003E0034076



What is the problem?
Can I change directly the configuration bits into CCS
I want to set the register CONFIG1H (Adress:0x300001) to 0xD2


Many thanks.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Jun 30, 2009 12:52 pm     Reply with quote

You could use a #rom statement:
Code:
#rom int8 0x300001 = {0xD2}
SAMIR_SBG



Joined: 01 Nov 2007
Posts: 9

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PostPosted: Wed Jul 01, 2009 10:58 am     Reply with quote

Thanks "PCM programmer" you are the best Smile
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