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AT91RM9200-CJ-002 Datasheet(PDF) 93 Page - ATMEL Corporation

Part # AT91RM9200-CJ-002
Description  ARM920T-based Microcontroller
Download  701 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91RM9200-CJ-002 Datasheet(HTML) 93 Page - ATMEL Corporation

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1768I–ATARM–09-Jul-09
AT91RM9200
Figure 13-9. Xmodem Transfer Example
13.4.1.3
USB Device Port
A 48 MHz USB clock is necessary to use USB Device port. It has been programmed earlier in
the device initialization with PLLB configuration.
13.4.1.4
DFU Protocol
The DFU allows upgrade of the firmware of USB devices. The DFU algorithm is a part of the
USB specification. For more details, refer to “USB Device Firmware Upgrade Specification, Rev.
1.0”.
There are four distinct steps when carrying out a firmware upgrade:
1.
Enumeration: The device informs the host of its capabilities.
2.
Reconfiguration: The host and the device agree to initiate a firmware upgrade.
3.
Transfer: The host transfers the firmware image to the device. Status requests are
employed to maintain synchronization between the host and the device.
4.
Manifestation: Once the device reports to the host that it has completed the reprogram-
ming operations, the host issues a reset and the device executes the upgraded
firmware.
Figure 13-10. DFU Protocol
Host
Device
SOH 01 FE Data[128] CRC CRC
C
ACK
SOH 02 FD Data[128] CRC CRC
ACK
SOH 03 FC Data[100] CRC CRC
ACK
EOT
ACK
Host
Device
Prepare for an upgrade
USB reset
DFU mode activated
Download this firmware
Prepare to exit DFU mode
USB reset


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