Atmel AVR XMEGA AU series Manual page 257

20.14.3 CNTL – Counter Low
8331B–AVR–03/12
interrupts or software intervention. See
packet transfers.
• Bit 4 – PINGPONG: Ping-pong Enable
Setting this bit enables ping-pong operation. Ping-pong operation enables both endpoints (IN
and OUT) with same address to be used in the same direction to allow double buffering and
maximize throughput. The endpoint in the opposite direction must be disabled when ping-pong
operation is enabled. Ping-pong operation is not possible for control endpoints. See
Operation" on page 242
• Bit 3 – INTDSBL: Interrupt Disable
Setting this bit disables all enabled interrupts from the endpoint. Hence, only the interrupt flags
in the STATUS register are updated when interrupt conditions occur. The FIFO does not store
this endpoint configuration table address upon transaction complete for the endpoint when inter-
rupts are disabled for an endpoint. Clearing this bit enables all previously enables interrupts
again.
• Bit 2 – STALL: Endpoint STALL
This bit controls the STALL behavior if the endpoint.
• Bit 1:0 – BUFSIZE[1:0]: Data Size
These bits configure the maximum data payload size for the endpoint. Incoming data bytes
exceeding the maximum data payload size are discarded.
• Bit 2:0 – BUFSIZE[2:0]: Data Size
These bits configure the maximum data payload size for the endpoint when configured for iso-
chronous operation.
Table 20-5. BUFSIZE configuration.
BUFSIZE[2:0] Group Configuration
000
001
010
011
(1)
100
(1)
101
(1)
110
(1)
111
Note: 1. Setting only available for isochronous endpoints.
The CNTL and CNTH registers represent the 10-bit value, CNT, that contains the number of
bytes received in the last OUT or SETUP transaction for an OUT endpoint, or the number of
bytes to be sent in the next IN transaction for an IN endpoint.
"Multipacket Transfers" on page 243
for details.
Description
8 8-byte buffer size
16 16-byte buffer size
32 32-byte buffer size
64 64-byte buffer size
128 128-byte buffer size
256 256-byte buffer size
512 512-byte buffer size
1023 1023-bytesbuffer size
Atmel AVR XMEGA AU
for details on multi-
"Ping-pong
257