PIC12F609T-I/P View Datasheet(PDF) - Microchip Technology
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Description
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PIC12F609T-I/P Datasheet PDF : 212 Pages
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PIC12F609/615/617/12HV609/615
10.2.6 A/D CONVERSION PROCEDURE
This is an example procedure for using the ADC to
perform an Analog-to-Digital conversion:
1. Configure Port:
• Disable pin output driver (See TRIS register)
• Configure pin as analog
2. Configure the ADC module:
• Select ADC conversion clock
• Configure voltage reference
• Select ADC input channel
• Select result format
• Turn on ADC module
3. Configure ADC interrupt (optional):
• Clear ADC interrupt flag
• Enable ADC interrupt
• Enable peripheral interrupt
• Enable global interrupt(1)
4. Wait the required acquisition time(2).
5. Start conversion by setting the GO/DONE bit.
6. Wait for ADC conversion to complete by one of
the following:
• Polling the GO/DONE bit
• Waiting for the ADC interrupt (interrupts
enabled)
7. Read ADC Result
8. Clear the ADC interrupt flag (required if interrupt
is enabled).
Note 1: The global interrupt can be disabled if the
user is attempting to wake-up from Sleep
and resume in-line code execution.
2: See Section 10.3 “A/D Acquisition
Requirements”.
EXAMPLE 10-1: A/D CONVERSION
;This code block configures the ADC
;for polling, Vdd reference, Frc clock
;and GP0 input.
;
;Conversion start & polling for completion
; are included.
;
BANKSEL TRISIO
;
BSF
TRISIO,0
;Set GP0 to input
BANKSEL ANSEL
;
MOVLW B’01110001’ ;ADC Frc clock,
IORWF ANSEL
; and GP0 as analog
BANKSEL ADCON0
;
MOVLW B’10000001’ ;Right justify,
MOVWF ADCON0
;Vdd Vref, AN0, On
CALL
SampleTime ;Acquisiton delay
BSF
ADCON0,GO ;Start conversion
BTFSC ADCON0,GO ;Is conversion done?
GOTO
$-1
;No, test again
BANKSEL ADRESH
;
MOVF
ADRESH,W
;Read upper 2 bits
MOVWF RESULTHI
;Store in GPR space
BANKSEL ADRESL
;
MOVF
ADRESL,W
;Read lower 8 bits
MOVWF RESULTLO
;Store in GPR space
2010 Microchip Technology Inc.
DS41302D-page 83
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