PIC16F7X Datasheet, PDF(87/174 Page) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

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PIC16F7X Datasheet, PDF (87/174 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

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PIC16F7X

The following steps should be followed for doing an

A/D conversion:

1. Configure the A/D module:

â¢ Configure analog pins, voltage reference,

and digital I/O (ADCON1)

â¢ Select A/D conversion clock (ADCON0)

â¢ Turn on A/D module (ADCON0)

2. Configure the A/D interrupt (if desired):

â¢ Clear ADIF bit

â¢ Set ADIE bit

â¢ Set PEIE bit

â¢ Set GIE bit

3. Select an A/D input channel (ADCON0).

FIGURE 11-1:

A/D BLOCK DIAGRAM

4. Wait for at least an appropriate acquisition

period.

5. Start conversion:

â¢ Set GO/DONE bit (ADCON0)

6. Wait for the A/D conversion to complete, by

either:

â¢ Polling for the GO/DONE bit to be cleared

(interrupts disabled)

OR

â¢ Waiting for the A/D interrupt

7. Read A/D result register (ADRES), and clear bit

ADIF if required.

8. For next conversion, go to step 3 or step 4, as

required.

CHS2:CHS0

111

RE2/AN7(1)

110

RE1/AN6(1)

101

RE0/AN5(1)

VIN

(Input Voltage)

100

RA5/AN4

011

RA3/AN3/VREF

A/D

Converter

010

RA2/AN2

001

RA1/AN1

VREF

VDD

000

RA0/AN0

000 or

010 or

100 or

11x

(Reference

Voltage)

001 or

011 or

101

PCFG2:PCFG0

Note 1: Not available on PIC16F73/76.

ï£© 2002 Microchip Technology Inc.

DS30325B-page 85

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