PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 214

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F/LF1XK50
17.2.9
This is an example procedure for using the ADC to
perform an Analog-to-Digital conversion:
1.
2.
3.
4.
5.
6.
7.
8.
DS41350E-page 214
Note 1: The global interrupt can be disabled if the
Configure Port:
• Disable pin output driver (See TRIS register)
• Configure pin as analog
Configure the ADC module:
• Select ADC conversion clock
• Configure voltage reference
• Select ADC input channel
• Select result format
• Select acquisition delay
• Turn on ADC module
Configure ADC interrupt (optional):
• Clear ADC interrupt flag
• Enable ADC interrupt
• Enable peripheral interrupt
• Enable global interrupt
Wait the required acquisition time
Start conversion by setting the GO/DONE bit.
Wait for ADC conversion to complete by one of
the following:
• Polling the GO/DONE bit
• Waiting for the ADC interrupt (interrupts
Read ADC Result
Clear the ADC interrupt flag (required if interrupt
is enabled).
enabled)
2: Software delay required if ACQT bits are
A/D CONVERSION PROCEDURE
user is attempting to wake-up from Sleep
and resume in-line code execution.
set to zero delay. See
Acquisition
Requirements”.
(1)
Section 17.3 “A/D
(2)
.
Preliminary
EXAMPLE 17-1:
;This code block configures the ADC
;for polling, Vdd and Vss as reference, Frc
clock and AN4 input.
;
;Conversion start & polling for completion
; are included.
;
MOVLW
MOVWF
MOVLW
MOVWF
BSF
BSF
MOVLW
MOVWF
BSF
ADCPoll:
BTFSC
BRA
; Result is complete - store 2 MSbits in
; RESULTHI and 8 LSbits in RESULTLO
MOVFF
MOVFF
B’10101111’ ;right justify, Frc,
ADCON2
B’00000000’ ;ADC ref = Vdd,Vss
ADCON1
TRISC,0
ANSEL,4
B’00010001’ ;AN4, ADC on
ADCON0
ADCON0,GO
ADCON0,GO
ADCPoll
ADRESH,RESULTHI
ADRESL,RESULTLO
A/D CONVERSION
 2010 Microchip Technology Inc.
; & 12 TAD ACQ time
;
;Set RC0 to input
;Set RC0 to analog
;
;Start conversion
;Is conversion done?
;No, test again