AT90USB128X Datasheet PDF - ATMEL Corporation
Part Number | AT90USB128X | |
Description | USB DFU Bootloader | |
Manufacturers | ATMEL Corporation | |
Logo | ||
There is a preview and AT90USB128X download ( pdf file ) link at the bottom of this page. Total 28 Pages |
Preview 1 page No Preview Available ! Features
• USB Protocol
– Based on the USB DFU class
– Autobaud (8/16 MHz crystal)
• In-System Programming
– Read/Write Flash and EEPROM on-chip memories
– Read Device ID
– Full chip Erase
– Start application command
• In-Application Programming
– Software Entry-points for on-chip flash drivers
1. Description
The 8bits mega AVR with USB interface devices are factory configured with a
USB bootloader located in the on-chip flash boot section of the controller.
This USB bootloader allows to perform In-System Programming from an USB
host controller without removing the part from the system or without a
pre-programmed application, and without any external programming interface.
This document describes the USB bootloader functionalities as well as the serial
protocol to efficiently perform operations on the on chip Flash memories (Flash
and EEPROM).
www.DataSheet4U.com
USB DFU
Bootloader
Datasheet
AT90USB128x
AT90USB64x
AT90USB162
AT90USB82
ATmega32U4
ATmega16U4
7618C–AVR–07/08
|
|
www.DataSheet4U.com
Offset
15
16
17
Field
iProduct
iSerialNumber
bNumConfigurations
Size
1
1
1
Value
0
0
01h
Description
Index of string descriptor
Index of string descriptor
One configuration only for DFU
4.3.2
DFU Configuration Descriptor
This descriptor is identical to the standard configuration descriptor described in the USB DFU
specification version 1.0, with the exception that the bNumInterfaces field must contain the value
01h.
4.3.2.1
DFU Interface Descriptor
This is the descriptor for the only interface available when operating in DFU mode. Therefore,
the value of the bInterfaceNumber field is always zero.
Table 4-3. DFU Mode Interface Description
Offset
0
1
2
3
4
5
6
7
8
Field
bLength
bDescriptorType
bInterfaceNumber
bAlternateSetting
bNumEndpoints
bInterfaceClass
bInterfaceSubClass
bInterfaceProtocol
iInterface
Size
1
1
1
1
1
1
1
1
1
Value
09h
04h
00h
00h
00h
FEh
01h
00h
00h
Description
Size of this descriptor, in bytes
INTERFACE descriptor type
Number of this interface
Alternate setting(1)
Only the control pipe is used
Application Specific Class Code
Device Firmware Upgrade Code
The device does not use a class specific protocol on this interface
Index of the String descriptor for this interface
Note:
1. Alternate settings can be used by an application to access additional memory segments. In this case, it is suggested that
each alternate setting employ a string descriptor to indicate the target memory segment; e.g., “EEPROM”. Details concern-
ing other possible uses of alternate settings are beyond the scope of this document. However, their use is intentionally not
restricted because the authors anticipate that implements will devise additional creative uses for alternate settings.
4.4 Commands Description
The protocol implemented in the AT90USB bootloader allows to:
• Initiate the communication
• Program the Flash or EEPROM Data
• Read the Flash or EEPROM Data
• Program Configuration Information
• Read Configuration and Manufacturer Information
• Erase the Flash
• Start the application
Overview of the protocol is detailed in “Appendix-A” on page 18.
7618C–AVR–07/08
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AT90USB128X electronic component. |
Information | Total 28 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ AT90USB128X.PDF Datasheet ] |
Share Link :
Electronic Components Distributor
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
Part Number | Description | MFRS |
AT90USB1286 | The function is 8-bit Microcontroller. ATMEL Corporation | |
AT90USB1286 | The function is (AT90USBxxx) 8-bit Microcontroller. ATMEL Corporation | |
AT90USB1287 | The function is 8-bit Microcontroller. ATMEL Corporation | |
Semiconductors commonly used in industry:
1N4148 |  
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
AT90
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA |