PIC16LF707-ESLASHML datasheet(82/284 Pages) MICROCHIP

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PIC16F707/PIC16LF707

DS41418A-page 82

Preliminary

 2010 Microchip Technology Inc.

9.2

ADC Operation

9.2.1

STARTING A CONVERSION

To enable the ADC module, the ADON bit of the

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

DONE bit of the ADCON0 register to a ‘1’ will start the

Analog-to-Digital conversion.

9.2.2

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 ADRES register with new conversion

result

9.2.3

TERMINATING A CONVERSION

If a conversion must be terminated before completion,

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

ADRES register will be updated with the partially com-

plete Analog-to-Digital conversion sample. Incomplete

bits will match the last bit converted.

9.2.4

ADC OPERATION DURING SLEEP

The ADC module can operate during Sleep. This

requires the ADC clock source to be set to the FRC

option. When the FRC clock source is selected, the

ADC waits one additional instruction before starting the

conversion. This allows the SLEEP instruction to be

executed, which can reduce system noise during the

conversion. If the ADC interrupt is enabled, the device

will wake-up from Sleep when the conversion

completes. If the ADC interrupt is disabled, the ADC

module is turned off after the conversion completes,

although the ADON bit remains set.

When the ADC clock source is something other than

FRC, a SLEEP instruction causes the present conver-

sion to be aborted and the ADC module is turned off,

although the ADON bit remains set.

9.2.5

SPECIAL EVENT TRIGGER

The Special Event Trigger of the CCP module allows

periodic ADC measurements without software inter-

vention. When this trigger occurs, the GO/DONE bit is

set by hardware and the Timer1 counter resets to zero.

Using the Special Event Trigger does not assure proper

ADC timing. It is the user’s responsibility to ensure that

the ADC timing requirements are met.

Refer to Section 17.0 “Capture/Compare/PWM

(CCP) Module” for more information.

9.2.6

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 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(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 to Section 9.2.6 “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-up from Sleep

and resume in-line code execution.

2: Refer to Section 9.3 “A/D Acquisition

Requirements”.

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