PIC16C717-I/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C717-I/SS

18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-Bit A/D

Microchip Technology 

PIC16C717/770/771

After the A/D module has been configured as desired

and the analog input channels have their correspond-

ing TRIS bits selected for port inputs, the selected

channel must be acquired before conversion is

started. The A/D conversion cycle can be initiated by

setting the GO/DONE bit. The A/D conversion begins

and lasts for 13TAD. The following steps should be fol-

lowed for performing an A/D conversion:

1. Configure port pins:

• Configure analog input mode (ANSEL)

• Configure pin as input (TRISA or TRISB)

2. Configure the A/D module

• Configure A/D Result Format / voltage refer-

ence (ADCON1)

• Select A/D input channel (ADCON0)

• Select A/D conversion clock (ADCON0)

• Turn on A/D module (ADCON0)

3. Configure A/D interrupt (if required)

• Clear ADIF bit

• Set ADIE bit

• Set PEIE bit

• Set GIE bit

FIGURE 11-3: A/D BLOCK DIAGRAM

4. Wait the required acquisition time (3TAD)

5. Start conversion

• Set GO/DONE bit (ADCON0)

6. Wait 13TAD until A/D conversion is complete, by

either:

• Polling for the GO/DONE bit to be cleared

OR

• Waiting for the A/D interrupt

7. Read A/D Result registers (ADRESH and

ADRESL), clear ADIF if required.

8. For next conversion, go to step 1, step 2 or step

3 as required.

Clearing the GO/DONE bit during a conversion will

abort the current conversion. The ADRESH and

ADRESL registers will be updated with the partially

completed A/D conversion value. That is, the ADRESH

and ADRESL registers will contain the value of the

current incomplete conversion.

Note:

Do not set the ADON bit and the GO/

DONE bit in the same instruction. Doing so

will cause the GO/DONE bit to be automat-

ically cleared.

CHS<3:0>

VAIN

(Input voltage)

VREF+

(Reference

voltage +)

AVDD

VRH

VRL

RB1/AN5/SS

RB0/AN4/INT

RA3/AN3/VREF+/VRH

RA2/AN2/VREF-/VRL

RA1/AN1

RA0/AN0

A/D

Converter

VCFG<2:0>

VREF-

(Reference

voltage -)

AVSS

VCFG<2:0>

VRL

© 1999 Microchip Technology Inc.

Advanced Information

DS41120A-page 117

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