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Analysis of the ADC converter of the 18F458
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vever001



Joined: 15 May 2010
Posts: 21

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PostPosted: Tue Dec 14, 2010 4:38 pm     Reply with quote

Thanks a lot for your answers it really helps me Wink

So I suppose I shouldn't use the adc_done interruption since it isn't as precise/accurate as a simple delay.

I have one more question:
Do I need to do something except changing the instruction #device adc=10 to #device adc=8 if I want to use the A/D module as a 8 bit converter ?

Thanks for your help
vever001



Joined: 15 May 2010
Posts: 21

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PostPosted: Tue Dec 14, 2010 7:54 pm     Reply with quote

Are you sure it needs 30 + instructions to quit the instruction handler ?
Because I see the retfie instruction who seems to quit the instruction (handler ?).

Ttelmah wrote:

Tacq, _can_ be programmed into the chips on the latter PICs.


What do you mean by programming the Tacq ?
It is just a delay...I don't really understand and what's the advantage...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Dec 14, 2010 8:11 pm     Reply with quote

Quote:
Are you sure it needs 30 + instructions to quit the instruction handler ?

See this thread which explains the CCS interrupt handler code:
http://www.ccsinfo.com/forum/viewtopic.php?t=29173

You can see the code for yourself by looking at the the .LST file.
Look at address 0004 for 16F PICs, or at address 0008 for 18F PICs.
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