PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

The ADRESH:ADRESL registers contain the result of

the A/D conversion. When the A/D conversion is

complete, the result is loaded into the A/D Result register

pair, 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 11-1.

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 inputs.

To determine sample time, see

Section 11.1 鈥淎/D

Acquisition Requirements鈥?

After this sample time

has elapsed, the A/D conversion can be started.

These steps should be followed for doing an A/D

conversion:

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.

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

(with interrupts disabled); OR

鈥?Waiting for the A/D interrupt

Read A/D Result register pair

(ADRESH:ADRESL), 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

. A minimum wait of 2 T

required before the next acquisition starts.

FIGURE 11-1:

A/D BLOCK DIAGRAM

CHS<3:0>

100

RA4/AN4

011

RA3/AN3/V

REF

010

(Input Voltage)

A/D

Converter

REF

(Reference

Voltage)

PCFG<3:0>

001

RA1/AN1

000

RA0/AN0

RA2/AN2/V

REF

(Reference

Voltage)

PCFG<3:0>

铮?/div>

2003 Microchip Technology Inc.

Preliminary

DS39598D-page 83

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