PIC18F258-ESLASHLSQTP datasheet(245/402 Pages) MICROCHIP

245 / 402 page

DS41159E-page 243

PIC18FXX8

The analog reference voltage is software selectable to

either the device’s positive and negative supply voltage

(VDD and VSS) or the voltage level on the RA3/AN3/

VREF+ pin and RA2/AN2/VREF- pin.

The A/D converter has a unique feature of being able

to operate while the device is in Sleep mode. To oper-

ate in Sleep, the A/D conversion clock must be derived

from the A/D’s internal RC oscillator.

The output of the sample and hold is the input into the

converter which generates the result via successive

approximation.

A device Reset forces all registers to their Reset state.

This forces the A/D module to be turned off and any

conversion is aborted.

Each port pin associated with the A/D converter can be

configured as an analog input (RA3 can also be a

voltage reference) or as a digital I/O.

The ADRESH and ADRESL registers contain the result

of the A/D conversion. When the A/D conversion is com-

plete, the result is loaded into the ADRESH/ADRESL

registers, the GO/DONE bit (ADCON0<2>) is cleared

and A/D Interrupt Flag bit, ADIF, is set. The block

diagram of the A/D module is shown in Figure 20-1.

FIGURE 20-1:

A/D BLOCK DIAGRAM

(Input Voltage)

VAIN

VREF+

Reference

voltage

VDD

PCFG0

CHS2:CHS0

AN7(1)

AN6(1)

AN5(1)

AN4

AN3

AN2

AN1

AN0

111

110

101

100

011

010

001

000

10-bit

Converter

VREF-

VSS

A/D

Note 1: Channels AN5 through AN7 are not available on PIC18F2X8 devices.

2: All I/O pins have diode protection to VDD and VSS.

PIC18F258-E/LSQTP Datasheet(PDF) 245 Page - Microchip Technology

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