PIC12C671 datasheet(47/129 Pages) MICROCHIP

47 / 129 page

DS30561B-page 47

PIC12C67X

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 A/D interrupt flag bit

ADIF (PIE1<6>) is set. The block diagrams of the A/D

module are shown in Figure 8-1.

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 sample time, see Section 8.1. After

this acquisition 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 and TRIS)

• 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, step 2 or

step 3 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 8-1:

A/D BLOCK DIAGRAM

(Input voltage)

VIN

VREF

(Reference

voltage)

VDD

PCFG<2:0>

CHS<1:0>

GP4/AN3

GP0/AN0

GP2/AN2

GP1/AN1/VREF

A/D

Converter

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