at43usb321 ATMEL Corporation, at43usb321 Datasheet

at43usb321

Manufacturer Part Number

at43usb321

Description

Full-speed Usb Hub/function Microcontroller

Manufacturer

ATMEL Corporation

Datasheet

1.AT43USB321.pdf (4 pages)

Current page: 1 of 4
Download datasheet (40Kb)

Features

•

Overview

The Atmel AT43USB321 is a single-chip microcontroller based USB hub with an

embedded function and a 16K byte masked ROM. The USB hub has five downstream

ports, one of which is permanently attached. Internally the AT43320 consists of a USB

hub and function interface, a hub repeater, and a high-performance, efficient 8-bit

RISC microcontroller. The hub and peripheral device controller function is imple-

mented in the microcontoller’s firmware. To the USB host, the embedded function

appears as an attached port of the hub with its own device address and endpoints.

The AT43USB321 can also be configured as a USB function without the hub.

The USB hardware block consists of a USB transceiver, SIE, hub repeater, endpoint

controllers, and an interface to the microcontroller. The USB hardware interfaces to

the USB host at the transaction level. The CPU of the microcontroller is based on the

Atmel AVR microcontroller. The AVR architecture was developed to be programmed

in C efficiently and with maximum performance.

8-bit AVR

16K Bytes ROM Program Memory

512 Bytes SRAM

32 x 8 General Purpose Working Registers

20 Programmable I/O Port Pins

Programmable Serial UART

SPI Serial Interface

One 8-bit Timer/Counter with Separate Prescaler

One 16-bit Timer/Counter with Separate Prescaler

External and Internal Interrupt Sources

Programmable Watchdog Timer with On-chip Oscillator

Bus-or Self-powered USB Hub with Four Downstream Ports

One Attached Function Port with Three Endpoints

Programmable 6/12 MHz Oscillator with PLL

On-chip 3.3V Supply for USB

42-pin SDIP and 48-lead TQFP Packages

Core with 83 ns Instruction Cycle Time

Full-speed USB

Hub/Function

Microcontroller

AT43USB321

Rev. 1442A–08/99

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at43usb321 Summary of contents

Page 1

... To the USB host, the embedded function appears as an attached port of the hub with its own device address and endpoints. The AT43USB321 can also be configured as a USB function without the hub. The USB hardware block consists of a USB transceiver, SIE, hub repeater, endpoint controllers, and an interface to the microcontroller ...

Page 2

... USB applications. Applications The attached diagram shows an application of the AT43USB321 in a monitor as a hub with two embedded functions: a monitor display controller and IR receiver. The number of external downstream ports of the hub is pro- AT43USB321 ...

Page 3

Figure 2. Hub/Monitor/IR Chip Application REMOTE IR IR XCVR UNIT HUB/MONITOR/IR CHIP IR XCVR DOWNSTREAM PORTS TO USB DEVICES /UART UPSTREAM PORT TO USB HOST MONITOR µC 3 ...

Page 4

... Atmel Corporation 1999. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard war- ranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...

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