Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD Data Sheet
Product codes
AT32UC3A3-XPLD
699
32072H–AVR32–10/2012
AT32UC3A3
• AUTOSW: Automatic Switch
This bit is cleared upon receiving a USB reset.
1: The automatic bank switching is enabled.
0: The automatic bank switching is disabled.
• EPDIR: Endpoint Direction
This bit is cleared upon receiving a USB reset.
1: The endpoint direction is IN (nor for control endpoints).
0: The endpoint direction is OUT.
• EPSIZE: Endpoint Size
This field shall be written to select the size of each endpoint bank. The maximum size of each endpoint is specified in
This field is cleared upon receiving a USB reset (except for the endpoint 0).
• EPBK: Endpoint Banks
This field shall be written to select the number of banks for the endpoint:
For control endpoints, a single-bank endpoint (0b00) shall be selected.
This field is cleared upon receiving a USB reset (except for the endpoint 0).
• ALLOC: Endpoint Memory Allocate
Writing a one to this bit will allocate the endpoint memory. The user should check the CFGOK bit to know whether the allocation
of this endpoint is correct.
Writing a zero to this bit will free the endpoint memory.
This bit is cleared upon receiving a USB reset (except for the endpoint 0).
EPSIZE
Endpoint Size
0
0
0
8 bytes
0
0
1
16 bytes
0
1
0
32 bytes
0
1
1
64 bytes
1
0
0
128 bytes
1
0
1
256 bytes
1
1
0
512 bytes
EPBK
Endpoint Banks
0
0
1 (single-bank endpoint)
0
1
2 (double-bank endpoint)
1
0
3 (triple-bank endpoint) if supported
).
1
1
Reserved