PIC18LF1320-I/SOSQTP 查看數據表（PDF） - Microchip Technology

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PIC18LF1320-I/SOSQTP

18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F1220/1320

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.

FIGURE 17-1:

A/D BLOCK DIAGRAM

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.

10-bit

Converter

A/D

Reference

Voltage

CHS2:CHS0

AVDD

111

110

101

100

VAIN

(Input Voltage)

011

010

001

VCFG1:VCFG0

AVDD

000

x0

VREFH

x1

1x

VREFL

0x

AVSS

AN6(1)

AN5

AN4

AN3/VREF+

AN2/VREF-

AN1

AN0

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

DS39605F-page 158

© 2007 Microchip Technology Inc.

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