PIC16F870SLASHP datasheet(81/156 Pages) MICROCHIP

81 / 156 page

Preliminary

DS30569A-page 81

PIC16F870/871

The ADRESH:ADRESL registers contain the 10-bit

result of the A/D conversion. When the A/D conversion

is complete, the result is loaded into this A/D result reg-

ister pair, the GO/DONE bit (ADCON0<2>) is cleared

and the A/D interrupt flag bit ADIF is set. The block dia-

gram of the A/D module is shown in Figure 10-1.

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 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

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 TAD. A minimum wait of 2TAD is

required before next acquisition starts.

PIC16F870/P Datasheet(PDF) 81 Page - Microchip Technology

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