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PIC A/D

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Daniel_Follmer
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PIC A/D

Posted: Sat Feb 20, 2010 4:54 pm

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I want to configure only one A/D channel using PIC16F716 but it is not possible.
The options offered by the compiler are below:

Code:

// Constants used in SETUP_ADC_PORTS() are:
#define NO_ANALOGS 7 // None
#define ALL_ANALOG 0 // A0 A1 A2 A3
#define AN0_AN1_AN2_VSS_VREF 1 // A0 A1 A2 VRefh=A3
#define AN0_AN1_AN3 4 // A0 A1 A3
#define AN0_AN1_VSS_VREF 5 // A0 A1 VRefh=A3
#define ANALOG_RA3_REF 1 //!old only provided for compatibility
#define RA0_RA1_RA3_ANALOG 4 //!old only provided for compatibility
#define RA0_RA1_ANALOG_RA3_REF 5 //!old only provided for compatibility

Could someone help me?

Thank you

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sat Feb 20, 2010 11:50 pm

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It's not the compiler. It's the PIC. Download the 16F716 data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/41206B.pdf
Look in this section:

Quote:

REGISTER 7-2: ADCON1: A/D CONTROL REGISTER 1

Look at the table for the PCFG bits.

Quote:

PCFG<2:0>

It shows 6 possible configurations of A/D pins. That's all you can do.
You can't select individual Analog pins with this PIC.

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