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cbraddoss



Joined: 15 Nov 2005
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adc
PostPosted: Tue Nov 15, 2005 3:17 pm     Reply with quote
Hello all,
Does anybody know the meaning of the mode option in the setup_adc() function?
It has options of ADC_OFF (obvious), ADC_CLOCK_DIV_2, ADC_CLOCK_DIV_8, ADC_CLOCK_INTERNAL, and such, but I am confused by what exactly this does for my ATD converter. It does not seem to be affecting my ATD. Maybe I am doing something wrong, I don't know.
Any help would be greatly appreciated.
Brad
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C. Brad Doss
"Where does the light go when you turn the switch off?"
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Nov 15, 2005 4:44 pm     Reply with quote
Quote:
Does anybody know the meaning of the mode option in the setup_adc() function?

Download the data sheet for the 16F877:
http://ww1.microchip.com/downloads/en/DeviceDoc/30292c.pdf
Look at Table 11-1 (page 117 in the Acrobat reader).
It shows a chart of A/D clock divisors, based on the PIC's crystal
frequency. These divisor values are reflected in the "mode" values
for the setup_adc() function.

Quote:
It does not seem to be affecting my ATD

Next, download the Reference Manual for the 10-bit A/D converter:
http://ww1.microchip.com/downloads/en/DeviceDoc/31023a.pdf
Look in this section on page 12:
"23.7.1 Faster Conversion -- Lower Resolution Trade-off"
This section explains how choosing the A/D clock divisor will affect
the accuracy and conversion time of the A/D.
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