PIC16LF870-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF870-I/SO

28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

Microchip Technology 

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:

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)

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 pair

(ADRESH:ADRESL), 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.

PIC16F870/871

© 1999 Microchip Technology Inc.

Preliminary

DS30569A-page 81

Share Link: