PIC12F683-ESLASHP datasheet(63/176 Pages) MICROCHIP

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DS41211D-page 61

PIC12F683

9.0

ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

The

Analog-to-Digital

Converter

(ADC)

allows

conversion of an analog input signal to a 10-bit binary

representation of that signal. This device uses analog

inputs, which are multiplexed into a single sample and

hold circuit. The output of the sample and hold is

connected to the input of the converter. The converter

generates a 10-bit binary result via successive

approximation and stores the conversion result into the

ADC result registers (ADRESL and ADRESH).

The ADC voltage reference is software selectable to

either VDD or a voltage applied to the external reference

pins.

The ADC can generate an interrupt upon completion of

a conversion. This interrupt can be used to wake-up the

device from Sleep.

Figure 9-1 shows the block diagram of the ADC.

FIGURE 9-1:

ADC BLOCK DIAGRAM

9.1

ADC Configuration

When configuring and using the ADC the following

functions must be considered:

• GPIO configuration

• Channel selection

• ADC voltage reference selection

• ADC conversion clock source

• Interrupt control

• Results formatting

9.1.1

GPIO CONFIGURATION

The ADC can be used to convert both analog and digital

signals. When converting analog signals, the I/O pin

should be configured for analog by setting the associated

TRIS and ANSEL bits. See the corresponding GPIO

section for more information.

9.1.2

CHANNEL SELECTION

The CHS bits of the ADCON0 register determine which

channel is connected to the sample and hold circuit.

When changing channels, a delay is required before

starting the next conversion. Refer to Section 9.2

“ADC Operation” for more information.

GP0/AN0

A/D

GP1/AN1/VREF

GP2/AN2

VDD

VREF

ADON

GO/DONE

VCFG = 1

VCFG = 0

CHS

ADRESH

ADRESL

ADFM

GP4/AN3

= Left Justify

= Right Justify

Note:

Analog voltages on any pin that is defined

as a digital input may cause the input

buffer to conduct excess current.

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