PIC16C745 Datasheet

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PIC16C745/765

The following steps should be followed for doing an A/D

conversion:

1.

Configure the A/D module:

鈥?Configure analog pins / voltage reference /

and digital I/O (ADCON1)

鈥?Select A/D input channel (ADCON0)

鈥?Select A/D conversion clock (ADCON0)

鈥?Turn on A/D module (ADCON0)

Configure A/D interrupt (if desired):

鈥?Clear ADIF bit

鈥?Set ADIE bit

鈥?Set GIE bit

Wait the required acquisition time.

4.

5.

Start conversion:

鈥?Set GO/DONE bit (ADCON0)

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

鈥?Polling for the GO/DONE bit to be cleared

OR

6.

7.

鈥?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 T

AD

. A minimum wait of 2T

AD

is

required before next acquisition starts.

2.

3.

FIGURE 12-1: A/D BLOCK DIAGRAM

CHS<2:0>

111

RE2/AN7(1)

110

RE1/AN6(1)

101

RE0/AN5(1)

100

V

IN

(Input voltage)

011

010

A/D

Converter

001

RA1/AN1

V

DD

000

or

010

or

100

or

11x

001

or

011

or

101

PCFG<2:0>

Note 1:

Not available on PIC16C745.

000

RA0/AN0

RA2/AN2

RA5/AN4

RA3/AN3/V

REF

V

REF

(Reference

voltage)

漏

1999 Microchip Technology Inc.

Advanced Information

DS41124A-page 91

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