PIC16F1503T-I 查看數據表（PDF） - Microchip Technology

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PIC16F1503T-I

14-Pin Flash, 8-Bit Microcontrollers

Microchip Technology 

PIC16(L)F1503

15.2.6 ADC 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 (Refer to the TRIS

register)

• Configure pin as analog (Refer to the ANSEL

register)

• Disable weak pull-ups either globally (Refer

to the OPTION_REG register) or individually

(Refer to the appropriate WPUx register).

2. Configure the ADC module:

• Select ADC conversion clock

• Configure voltage reference

• Select ADC input channel

• 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: Refer to Section 15.4 “ADC Acquisi-

tion Requirements”.

EXAMPLE 15-1: ADC CONVERSION

;This code block configures the ADC

;for polling, Vdd and Vss references, FRC

;oscillator and AN0 input.

;

;Conversion start & polling for completion

; are included.

;

BANKSEL ADCON1

;

MOVLW

B’11110000’ ;Right justify, FRC

;oscillator

MOVWF

ADCON1

;Vdd and Vss Vref+

BANKSEL TRISA

;

BSF

TRISA,0

;Set RA0 to input

BANKSEL ANSEL

;

BSF

ANSEL,0

;Set RA0 to analog

BANKSEL WPUA

BCF

WPUA,0

;Disable weak

pull-up on RA0

BANKSEL ADCON0

;

MOVLW

B’00000001’ ;Select channel AN0

MOVWF

ADCON0

;Turn ADC On

CALL

SampleTime ;Acquisiton delay

BSF

ADCON0,ADGO ;Start conversion

BTFSC

ADCON0,ADGO ;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

DS40001607D-page 118

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