PIC18F452-I/ML【PDF 118/134 页】IC MCU FLASH 16KX16 A/D 44QFN

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PIC16C9XX

DS30444E - page 84

1997 Microchip Technology Inc.

12.4

A/D Conversions

Example 12-2 show how to perform an A/D conversion.

The RA pins are congured as analog inputs. The ana-

log reference (VREF) is the device VDD. The A/D inter-

rupt is enabled, and the A/D conversion clock is FRC.

The conversion is performed on the RA0 pin

(channel0).

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 12-2: DOING AN A/D CONVERSION

BCF

STATUS, RP1

; Select Bank1

BSF

STATUS, RP0

;

CLRF

ADCON1

; Configure A/D inputs

BSF

PIE1,

ADIE

; Enable A/D interrupts

BCF

STATUS, RP0

; Select Bank0

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 acquisition 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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