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| Features * * * * * * * * * * * * * * * * 8-bit AVR(R) 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 Full-speed USB Hub/Function Microcontroller AT43USB321 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 implemented 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. Rev. 1442A-08/99 1 Figure 1. AT43USB321 Block Diagram LFT OSC1 OSC2 6/12M OSC & PLL PORT4 DP4 DM4 DP0 DM0 SERIAL INTERFACE ENGINE DP3 PORT3 DM3 PA[0:7] PB[0:7] HUB REPEATER DP2 DM2 PORT2 DP1 DM1 HUB AND DEVICE CONTROLLER OVC PWR PD0/RXD PD1/TXD PD2/INT0 PD3/INT1 PORT1 CEXT VCC VSS GENERAL PURPOSE IO RST Development Support The AT4USB321 uses the same program and development tools as the Atmel AVR microcontrollers including: C compilers, macro assemblers, program debuggers/simulators, in-circuit emulators. The AT43USB321 is binary compatible with the AT43320 and the two share the same development kit, which includes firmware source code for the most common USB applications. 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 monitor'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 microcontroller. 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 monitor. The IR receiver function is also implemented in firmware also and can support any consumer type IR protocol that uses a frequency in the range of up to 52 kHz. 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- 2 AT43USB321 AT43USB321 Figure 2. Hub/Monitor/IR Chip Application HUB/MONITOR/IR CHIP I 2C /UART MONITOR C REMOTE IR UNIT IR XCVR IR XCVR UPSTREAM PORT DOWNSTREAM PORTS TO USB HOST TO USB DEVICES 3 Atmel Headquarters Corporate Headquarters 2325 Orchard Parkway San Jose, CA 95131 TEL (408) 441-0311 FAX (408) 487-2600 Atmel Operations Atmel Colorado Springs 1150 E. Cheyenne Mtn. Blvd. Colorado Springs, CO 80906 TEL (719) 576-3300 FAX (719) 540-1759 Europe Atmel U.K., Ltd. Coliseum Business Centre Riverside Way Camberley, Surrey GU15 3YL England TEL (44) 1276-686-677 FAX (44) 1276-686-697 Atmel Rousset Zone Industrielle 13106 Rousset Cedex France TEL (33) 4-4253-6000 FAX (33) 4-4253-6001 Asia Atmel Asia, Ltd. Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 Japan Atmel Japan K.K. 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 Fax-on-Demand North America: 1-(800) 292-8635 International: 1-(408) 441-0732 literature@atmel.com Web Site http://www.atmel.com BBS 1-(408) 436-4309 (c) Atmel Corporation 1999. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty 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. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. Marks bearing (R) and/or TM are registered trademarks and trademarks of Atmel Corporation. Printed on recycled paper. 1442A-08/99/xM Terms and product names in this document may be trademarks of others. |
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