PIC16F720 datasheet(77/244 Pages) MICROCHIP

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Preliminary

DS41430B-page 77

PIC16(L)F720/721

9.0

ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

The

Analog-to-Digital

Converter

(ADC)

allows

conversion of an analog input signal to a 8-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

8-bit

binary

result

via

successive

approximation and stores the conversion result into the

ADC result register (ADRES). Figure 9-1 shows the

block diagram of the ADC.

The ADC voltage reference, FVREF, is an internally

generated supply only.

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:

ADC BLOCK DIAGRAM

AN0

AN1

AN2

AN4

ADON

GO/DONE

CHS<3:0>

VSS

AN5

AN6

AN7

AN3

AN8

AN9

AN10

AN11

Temperature Indicator

FVREF

0000

0001

0010

0011

0100

0101

0111

0110

1000

1001

1010

1011

1110

1111

ADC

ADRES

AVDD

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