PIC16LC712 datasheet(47/106 Pages) MICROCHIP

47 / 106 page

 1999-2013 Microchip Technology Inc.

DS41106C-page 47

PIC16C712/716

The ADRES register contains the result of the A/D

conversion. When the A/D conversion is complete, the

result is loaded into the ADRES register, the GO/DONE

bit (ADCON0<2>) is cleared and the A/D Interrupt Flag

bit ADIF is set. The block diagram of the A/D module is

shown in Figure 8-3.

The value that is in the ADRES register is not modified

for a Power-on Reset. The ADRES register will contain

unknown data after a Power-on Reset.

After the A/D module has been configured as desired,

the selected channel must be acquired before the

conversion is started. The analog input channels must

have their corresponding TRIS bits selected as an

input. To determine acquisition time, see Section 8.1

“A/D Acquisition Requirements”. After this acquisi-

tion time has elapsed, the A/D conversion can be

started. The following steps should be followed for

doing an A/D conversion:

Configure the A/D module:

• Configure analog pins/voltage reference/

and digital I/O (ADCON1)

• Select A/D input channel (ADCON0)

• Select A/D conversion clock (ADCON0)

• Turn on A/D module (ADCON0)

Configure A/D interrupt (if desired):

• Clear ADIF bit

• Set ADIE bit

• Set GIE bit

Wait the required acquisition time.

Start conversion:

• Set GO/DONE bit (ADCON0)

Wait for A/D conversion to complete, by either:

• Polling for the GO/DONE bit to be cleared

• Waiting for the A/D interrupt

Read A/D Result register (ADRES), clear bit

ADIF if required.

For the next conversion, go to step 1 or step 2

as required. The A/D conversion time per bit is

defined as TAD. A minimum wait of 2TAD is

required before next acquisition starts.

FIGURE 8-3:

A/D BLOCK DIAGRAM

(Input voltage)

VIN

VREF

(Reference

voltage)

VDD

PCFG2:PCFG0

CHS2:CHS0

000

010

110

or 111

001

011

101

RA3/AN3/VREF

RA2/AN2

RA1/AN1

RA0/AN0

011

010

001

000

A/D

Converter

100

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