MCP19124 datasheet(122/236 Pages) MICROCHIP

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MCP19124/5

DS20005619A-page 122

 2016 Microchip Technology Inc.

19.2

ADC Operation

19.2.1

STARTING A CONVERSION

To enable the ADC module, the ADON bit in the

ADCON0 register must be set to a ‘1’. Setting the

GO/DONE bit in the ADCON0 register to a ‘1’ will start

the analog-to-digital conversion.

19.2.2

COMPLETION OF A CONVERSION

When the conversion is complete, the ADC module will:

• Clear the GO/DONE bit

• Set the ADIF Interrupt Flag bit

• Update the ADRESH:ADRESL registers with new

conversion result

19.2.3

TERMINATING A CONVERSION

If a conversion must be terminated before completion,

the GO/DONE bit can be cleared in software. The

ADRESH:ADRESL registers will not be updated with

the partially complete analog-to-digital conversion

sample. Instead, the ADRESH:ADRESL register pair

will retain the value of the previous conversion.

Additionally, two ADC clock cycles are required before

another acquisition can be initiated. Following the

delay, an input acquisition is automatically started on

the selected channel.

19.2.4

ADC OPERATION DURING SLEEP

The ADC is not operational during Sleep mode. The

AVDD 4V reference has been removed to minimize

Sleep current.

19.2.5

A/D CONVERSION PROCEDURE

This is an example procedure for using the ADC to

perform an analog-to-digital conversion:

Configure Port:

• Disable pin output driver (refer to the

TRISGPx registers)

• Configure pin as analog (refer to the ANSELx

registers)

Configure the ADC module:

• Select ADC conversion clock

• 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 (1)

Wait the required acquisition time (2).

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

enabled)

Read ADC Result.

Clear the ADC interrupt flag (required if interrupt

is enabled).

Note:

The GO/DONE bit should not be set in the

same instruction that turns on the ADC.

Refer

Section 19.2.5

“A/D

Conversion Procedure”.

Note:

A device reset forces all registers to their

Reset state. Thus, the ADC module is

turned off and any pending conversion is

terminated.

Note 1: The global interrupt can be disabled if the

user is attempting to wake the device up

from Sleep and resume in-line code exe-

cution.

2: Refer to Section 19.4 “A/D Acquisition

Requirements”.

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