PIC12F615 datasheet(67/168 Pages) MICROCHIP

67 / 168 page

Preliminary

DS41302A-page 65

PIC12F609/615/12HV609/615

9.0

ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

(PIC12F615/HV615 ONLY)

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 (+3 INTERNAL)

GP0/AN0

A/D

GP1/AN1/VREF

GP2/AN2

CVREF

VDD

VREF

ADON

GO/DONE

VCFG = 1

VCFG = 0

CHS

VSS

0.6V Reference

1.2V Reference

GP4/AN3

ADRESH

ADRESL

ADFM

0 = Left Justify

1 = Right Justify

000

001

010

011

100

101

110

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