39504 datasheet(13/16 Pages) MICROCHIP

Il numero della parte	39504

Spiegazioni elettronici	Section 4. Architecture

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Produttore elettronici	MICROCHIP [Microchip Technology]

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 2000 Microchip Technology Inc.

DS39504A-page 4-13

Section 4 Architecture

VREF

Analog

Analog High Voltage Reference input.

DR reference voltage output on devices with comparators.

VREF+

Analog

Analog High Voltage Reference input.

Usually multiplexed onto an analog pin.

VREF-

Analog

Analog Low Voltage Reference input.

Usually multiplexed onto an analog pin.

VSS

—

Ground reference for logic and I/O pins.

VDD

—

Positive supply for logic and I/O pins.

VPP

—

Programming voltage input

TTL

Write control for parallel slave port (See CS and RD pins also).

WRL

—

System bus write low byte strobe

WRH

—

System bus write high byte strobe

Table 4-1:

I/O Descriptions (Continued)

Pin Name

Type

Buffer

Type

Description

Legend: TTL = TTL-compatible input

CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels

O = output

PU = Weak internal pull-up

I = input

Analog = Analog input or output

P = Power

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