PIC12F752 datasheet(97/204 Pages) MICROCHIP

97 / 204 page

 2011 Microchip Technology Inc.

Preliminary

DS41576A-page 97

PIC12F752/HV752

12.0

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 12-1 shows the block diagram of the ADC.

FIGURE 12-1:

ADC BLOCK DIAGRAM

Note:

The ADRESL and ADRESH registers are

Read-Only.

AN0

A/D

AN1/VREF+

AN2

VDD

VREF+

ADON

GO/DONE

VCFG = 1

VCFG = 0

CHS<3:0>

Vss

dac_ref

fvr_ref

AN3

ADRESH

ADRESL

ADFM

= Left Justify

= Right Justify

0000

0001

0010

0011

1110

1111

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