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PIC16C62B/72A

1999 Microchip Technology Inc.

Preliminary

DS35008B-page 51

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 9-1.

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 con-

version is started. The analog input channels must

have their corresponding TRIS bits selected as an

input. To determine acquisition time, see Section 9.1.

After this acquisition time has elapsed, the A/D conver-

sion can be started. The following steps should be fol-

lowed 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 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 9-1:

A/D BLOCK DIAGRAM

(Input voltage)

VIN

VREF

(Reference

voltage)

VDD

PCFG2:PCFG0

CHS2:CHS0

000 or

010 or

100 or

001 or

011 or

101

RA5/AN4

RA3/AN3/VREF

RA2/AN2

RA1/AN1

RA0/AN0

100

011

010

001

000

A/D

Converter

11x

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