PIC16LF72SLASHP datasheet(56/136 Pages) MICROCHIP

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PIC16F72

DS39597B-page 54

 2002 Microchip Technology Inc.

ADCON1: A/D CONTROL REGISTER 1 (ADDRESS 9Fh)

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 10-1.

The value in the ADRES register is not modified for a

Power-on Reset. The ADRES register will contain

unknown data after a Power-on Reset.

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 10.1.

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 2 TAD is

required before the next acquisition starts.

U-0

R/W-0

—

PCFG2

PCFG1

PCFG0

bit 7

bit 0

bit 7-3

Unimplemented: Read as ‘0’

bit 2-0

PCFG<2:0>: A/D Port Configuration Control bits

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

A = Analog input

D = Digital I/O

PCFG2:PCFG0

RA0

RA1

RA2

RA5

RA3

VREF

000

VDD

001

VREF

RA3

010

VDD

011

VREF

RA3

100

VDD

101

VREF

RA3

11x

VDD

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