PIC17C7XX_13 Datasheet, PDF(181/306 Page) Microchip Technology – High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D

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PIC17C7XX_13 Datasheet, PDF (181/306 Pages) Microchip Technology – High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D

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PIC17C7XX

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 A/D interrupt flag bit, ADIF is set. The block

diagrams of the A/D module are shown in Figure 16-1.

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 DDR bits selected as inputs.

To determine sample time, see Section 16.1. 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:

a) Configure analog pins/voltage reference/

and digital I/O (ADCON1)

b) Select A/D input channel (ADCON0)

c) Select A/D conversion clock (ADCON0)

d) Turn on A/D module (ADCON0)

FIGURE 16-1:

A/D BLOCK DIAGRAM

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

a) Clear ADIF bit

b) Set ADIE bit

c) Clear GLINTD bit

3. Wait the required acquisition time.

4. Start conversion:

a) Set GO/DONE bit (ADCON0)

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

a) Polling for the GO/DONE bit to be cleared

OR

b) 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.

CHS3:CHS0

A/D

Converter

VIN

(Input Voltage)

PCFG0

(Reference

Voltage)

VREF-

VREF+

AVSS

AVDD

Note 1: These channels are only available on PIC16C76X devices.

1011

1011

1011

1011

1011

1010

1001

1000

0111

0110

0101

0100

0011

0010

0001

0000

AN15(1)

AN14(1)

AN13(1)

AN12(1)

AN11

AN10

AN9

AN8

AN7

AN6

AN5

AN4

AN3

AN2

AN1/VREF-

AN0/VREF+

ï£ 1998-2013 Microchip Technology Inc.

DS30289C-page 181

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