PIC12C67X datasheet(50/129 Pages) MICROCHIP

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PIC12C67X

DS30561B-page 50

8.4

A/D Conversions

Example 8-2 shows how to perform an A/D conversion.

The GPIO pins are configured as analog inputs. The

analog reference (VREF) is the device VDD. The A/D

interrupt is enabled and the A/D conversion clock is

FRC. The conversion is performed on the GP0 channel.

Note:

The GO/DONE bit should NOT be set in

the same instruction that turns on the A/D.

Clearing the GO/DONE bit during a conversion will

abort the current conversion. The ADRES register will

NOT be updated with the partially completed A/D con-

version sample. That is, the ADRES register will con-

tinue to contain the value of the last completed

conversion (or the last value written to the ADRES reg-

ister). After the A/D conversion is aborted, a 2TAD wait

is required before the next acquisition is started. After

this 2TAD wait, an acquisition is automatically started on

the selected channel.

EXAMPLE 8-2:

DOING AN A/D CONVERSION

BSF

STATUS, RP0

; Select Page 1

CLRF

ADCON1

; Configure A/D inputs

BSF

PIE1,

ADIE

; Enable A/D interrupts

BCF

STATUS, RP0

; Select Page 0

MOVLW

0xC1

; RC Clock, A/D is on, Channel 0 is selected

MOVWF

ADCON0

;

BCF

PIR1,

ADIF

; Clear A/D interrupt flag bit

BSF

INTCON, PEIE

; Enable peripheral interrupts

BSF

INTCON, GIE

; Enable all interrupts

;

Ensure that the required sampling time for the selected input channel has elapsed.

;

Then the conversion may be started.

;

BSF

ADCON0, GO

; Start A/D Conversion

; The ADIF bit will be set and the GO/DONE bit

;

is cleared upon completion of the A/D Conversion.

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