PIC16C71 datasheet(39/176 Pages) MICROCHIP

39 / 176 page

DS30272A-page 39

PIC16C71X

The ADRES register contains the result of the A/D con-

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

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

bit (ADCON0<2>) is cleared, and A/D interrupt ﬂag bit

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

shown in Figure 7-4.

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 7.1.

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 7-4:

A/D BLOCK DIAGRAM

(Input voltage)

VIN

VREF

(Reference

voltage)

VDD

PCFG1:PCFG0

CHS1:CHS0

RA3/AN3/VREF

RA0/AN0

RA2/AN2

RA1/AN1

A/D

Converter

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