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AT43USB321 PDF даташит

Спецификация AT43USB321 изготовлена ​​​​«ATMEL Corporation» и имеет функцию, называемую «Full-speed USB Hub/Function Microcontroller».

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Номер произв AT43USB321
Описание Full-speed USB Hub/Function Microcontroller
Производители ATMEL Corporation
логотип ATMEL Corporation логотип 

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AT43USB321 Даташит, Описание, Даташиты
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Features
8-bit AVR® Core with 83 ns Instruction Cycle Time
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
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.
Full-speed USB
Hub/Function
Microcontroller
AT43USB321
Rev. 1442A–08/99
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AT43USB321 Даташит, Описание, Даташиты
Figure 1. AT43USB321 Block Diagram
LFT
OSC1
OSC2
6/12M
DP0
DM0
PA[0:7]
PB[0:7]
PD0/RXD
PD1/TXD
PD2/INT0
PD3/INT1
CEXT
VCC
VSS
OSC
&
PLL
SERIAL
INTERFACE
ENGINE
PORT4
PORT3
HUB
REPEATER
PORT2
HUB AND
DEVICE
CONTROLLER
PORT1
GENERAL PURPOSE IO
DP4
DM4
DP3
DM3
DP2
DM2
DP1
DM1
OVC
PWR
RST
Development Support
The AT4USB321 uses the same program and development
tools as the Atmel AVR microcontrollers including: C com-
pilers, macro assemblers, program debuggers/simulators,
in-circuit emulators. The AT43USB321 is binary compatible
with the AT43320 and the two share the same develop-
ment kit, which includes firmware source code for the most
common 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-
grammable from one to four. The hub can be self-powered
or bus-powered. In most cases, hubs in the monitors will be
self-powered because of the readily availability of the
power supply and its more versatility.
In this example, the AT43USB321 interfaces to the moni-
tor’s microcontroller, the host microcontroller, through an
I2C serial bus that supports two way communications such
as DDC2Bi. The firmware inside the AT43USB321 acts as
the translator between the host system and the host micro-
controller. This function can be performed without any
modification in the host microcontroller’s firmware resulting
in a very flexible way of adding USB capability in any moni-
tor. The IR receiver function is also implemented in
firmware also and can support any consumer type IR proto-
col that uses a frequency in the range of up to 52 kHz.
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AT43USB321 Даташит, Описание, Даташиты
Figure 2. Hub/Monitor/IR Chip Application
REMOTE
IR
UNIT
IR
XCVR
IR
XCVR
AT43USB321
HUB/MONITOR/IR
CHIP
I 2C /UART
MONITOR
µC
DOWNSTREAM
PORTS
UPSTREAM
PORT
TO USB DEVICES
TO USB HOST
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