PIC12F1822 MICROCHIP [Microchip Technology], PIC12F1822 Datasheet - Page 138

• Manufacturer Part Number: PIC12F1822
• Description: 8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC12F/LF1822/16F/LF1823
15.2.6
This is an example procedure for using the ADC to
perform an Analog-to-Digital conversion:
1.
2.
3.
4.
5.
6.
7.
8.
DS41413A-page 138
Note 1: The global interrupt can be disabled if the
Configure Port:
• Disable pin output driver (Refer to the TRIS
• Configure pin as analog (Refer to the ANSEL
Configure the ADC module:
• Select ADC conversion clock
• Configure voltage reference
• Select ADC input channel
• 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).
register)
register)
enabled)
2: Refer to Section 15.3 “A/D Acquisition
A/D CONVERSION PROCEDURE
user is attempting to wake-up from Sleep
and resume in-line code execution.
Requirements”.
(1)
(2)
.
Preliminary
EXAMPLE 15-1:
;This code block configures the ADC
;for polling, Vdd and Vss references, Frc
;clock and AN0 input.
;
;Conversion start & polling for completion
; are included.
;
BANKSEL
MOVLW
MOVWF
BANKSEL
BSF
BANKSEL
BSF
BANKSEL
MOVLW
MOVWF
CALL
BSF
BTFSC
GOTO
BANKSEL
MOVF
MOVWF
BANKSEL
MOVF
MOVWF
ADCON1
B’11110000’ ;Right justify, Frc
ADCON1
TRISA
TRISA,0
ANSEL
ANSEL,0
ADCON0
B’00000001’ ;Select channel AN0
ADCON0
SampleTime
ADCON0,ADGO ;Start conversion
ADCON0,ADGO ;Is conversion done?
$-1
ADRESH
ADRESH,W
RESULTHI
ADRESL
ADRESL,W
RESULTLO
A/D CONVERSION
 2010 Microchip Technology Inc.
;
;clock
;Vdd and Vss Vref
;
;Set RA0 to input
;
;Set RA0 to analog
;
;Turn ADC On
;Acquisiton delay
;No, test again
;
;Read upper 2 bits
;store in GPR space
;
;Read lower 8 bits
;Store in GPR space