PIC16LC77T-04P 查看數據表（PDF） - Microchip Technology

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PIC16LC77T-04P

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C7X

13.4 A/D Conversions

Applicable Devices

72 73 73A 74 74A 76 77

Example 13-2 shows how to perform an A/D conver-

sion. The RA 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 RA0 pin

(channel 0).

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 13-2: A/D CONVERSION

BSF

STATUS, RP0

; Select Bank 1

BCF

STATUS, RP1

; PIC16C76/77 only

CLRF ADCON1

; Configure A/D inputs

BSF

PIE1, ADIE

; Enable A/D interrupts

BCF

STATUS, RP0

; Select Bank 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.

DS30390E-page 122

© 1997 Microchip Technology Inc.

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