at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 103
at91sam9263
Manufacturer Part Number
at91sam9263
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9263.pdf
(1065 pages)
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Figure 13-7. Xmodem Transfer Example
13.7.3
13.7.3.1
6249D–ATARM–20-Dec-07
USB Device Port
Enumeration Process
A 48 MHz USB clock is necessary to use the USB Device port. It has been programmed earlier
in the device initialization procedure with PLLB configuration.
The device uses the USB communication device class (CDC) drivers to take advantage of the
installed PC RS-232 software to talk over the USB. The CDC class is implemented in all
releases of Windows
www.usb.org, describes a way to implement devices such as ISDN modems and virtual COM
ports.
The Vendor ID is Atmel’s vendor ID 0x03EB. The product ID is 0x6124. These references are
used by the host operating system to mount the correct driver. On Windows systems, the INF
files contain the correspondence between vendor ID and product ID.
Atmel provides an INF example to see the device as a new serial port and also provides another
custom driver used by the SAM-BA application: atm6124.sys. Refer to the document “USB Basic
Application”, literature number 6123, for more details.
The USB protocol is a master/slave protocol. This is the host that starts the enumeration send-
ing requests to the device through the control endpoint. The device handles standard requests
as defined in the USB Specification.
Table 13-4.
Request
GET_DESCRIPTOR
SET_ADDRESS
SET_CONFIGURATION
GET_CONFIGURATION
Host
Handled Standard Requests
SOH 02 FD Data[128] CRC CRC
®
SOH 01 FE Data[128] CRC CRC
SOH 03 FC Data[100] CRC CRC
, from Windows 98SE to Windows XP. The CDC document, available at
ACK
EOT
ACK
ACK
ACK
C
Definition
Returns the current device configuration value.
Sets the device address for all future device access.
Sets the device configuration.
Returns the current device configuration value.
AT91SAM9263 Preliminary
Device
103
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