PIC12CE673 datasheet(39/116 Pages) MICROCHIP

39 / 116 page

Preliminary

DS40181B-page 39

PIC12CE67X

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

module are shown in Figure 8-3.

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)

• 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 8-3:

A/D BLOCK DIAGRAM

(Input voltage)

VIN

VREF

(Reference

voltage)

VDD

PCFG2:PCFG0

CHS1:CHS0

000 or

010 or

100 or

001 or

GP4/AN3

GP0/AN0

GP2/AN2

GP1/AN1/VREF

A/D

Converter

011 or

101

110 or

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