PIC16LC71T-04SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

PIC16LC71T-04SP

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

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:

1. 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)

FIGURE 7-4: A/D BLOCK DIAGRAM

2. Configure A/D interrupt (if desired):

• Clear ADIF bit

• Set ADIE bit

• Set GIE bit

3. Wait the required acquisition time.

4. Start conversion:

• Set GO/DONE bit (ADCON0)

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

• Polling for the GO/DONE bit to be cleared

OR

• Waiting for the A/D interrupt

6. Read A/D Result register (ADRES), clear bit

ADIF if required.

7. 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.

CHS1:CHS0

A/D

Converter

VIN

(Input voltage)

VREF

(Reference

voltage)

VDD

00 or

10 or

11

01

PCFG1:PCFG0

11

RA3/AN3/VREF

10

RA2/AN2

01

RA1/AN1

00

RA0/AN0

© 1997 Microchip Technology Inc.

DS30272A-page 39

Share Link: