Datasheet

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
Table 27-
1 on page 624
.
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
00116 bytes
01032 bytes
01164 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
(see Table 27-1 on page 624).
11Reserved