PIC18F1220ESLASHSOSQTP datasheet(160/308 Pages) MICROCHIP

160 / 308 page

PIC18F1220/1320

DS39605F-page 158

The analog reference voltage is software selectable to

either the device’s positive and negative supply voltage

(AVDD and AVSS), or the voltage level on the

RA3/AN3/VREF+ and RA2/AN2/VREF- pins.

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 in progress is aborted.

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

configured as an analog input, 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 register) is

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

diagram of the A/D module is shown in Figure 17-1.

FIGURE 17-1:

A/D BLOCK DIAGRAM

(Input Voltage)

VAIN

VREFH

Reference

Voltage

AVDD

VCFG1:VCFG0

CHS2:CHS0

AN6(1)

AN5

AN4

AN3/VREF+

AN2/VREF-

AN1

AN0

111

110

101

100

011

010

001

000

10-bit

Converter

VREFL

AVSS

A/D

Note 1: I/O pins have diode protection to VDD and VSS.

AVDD

PIC18F1220E/SOSQTP Datasheet(PDF) 160 Page - Microchip Technology

PIC18F1220E/SOSQTP Datasheet(HTML) 160 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL