Datasheet

283
7766F–AVR–11/10
ATmega16/32U4
00b: Control10b: Bulk
01b: Isochronous11b: Interrupt
• 5-1 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 0 - EPDIR - Endpoint Direction Bit
Set to configure an IN direction for bulk, interrupt or isochronous endpoints.
Clear to configure an OUT direction for bulk, interrupt, isochronous or control endpoints.
• 7 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 6-4 - EPSIZE2:0 - Endpoint Size Bits
Set this bit according to the endpoint size:
000b: 8 bytes100b: 128 bytes
001b: 16 bytes101b: 256 bytes
010b: 32 bytes110b: 512 bytes
011b: 64 bytes111b: Reserved. Do not use this configuration.
• 3-2 - EPBK1:0 - Endpoint Bank Bits
Set this field according to the endpoint size:
00b: One bank
01b: Double bank
1xb: Reserved. Do not use this configuration.
• 1 - ALLOC - Endpoint Allocation Bit
Set this bit to allocate the endpoint memory.
Clear to free the endpoint memory.
See Section 22.6, page 267 for more details.
• 0 - Reserved
The value read from these bits is always 0. Do not set these bits.
Bit 7 6 5 4 3 2 1 0
- EPSIZE2:0 EPBK1:0 ALLOC - UECFG1X
Read/Write R R/W R/W R/W R/W R/W R/W R
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
CFGOK OVERFI UNDERFI - DTSEQ1:0 NBUSYBK1:0 UESTA0X
Read/Write R R/W R/W R/W R R R R
Initial Value 0 0 0 0 0 0 0 0