SAM7X256_14 Datasheet, PDF (460/662 Pages) ATMEL Corporation – ARM-based Flash MCU

When the device firmware has polled this bit or has been interrupted by this signal, it must transfer data from the FIFO to micro-
controller memory. The number of bytes received is available in RXBYTECNT field. Bank 1 FIFO values are read through UDP_
FDRx register. Once a transfer is done, the device firmware must release Bank 1 to the USB device by clearing RX_DATA_BK1.
• DIR: Transfer Direction (only available for control endpoints)
Read/Write
0 = Allows Data OUT transactions in the control data stage.
1 = Enables Data IN transactions in the control data stage.
Refer to Chapter 8.5.3 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the control data stage.
This bit must be set before UDP_ CSRx/RXSETUP is cleared at the end of the setup stage. According to the request sent in the
setup data packet, the data stage is either a device to host (DIR = 1) or host to device (DIR = 0) data transfer. It is not necessary
to check this bit to reverse direction for the status stage.
• EPTYPE[2:0]: Endpoint Type
Read/Write
000
001
101
010
110
011
111
Control
Isochronous OUT
Isochronous IN
Bulk OUT
Bulk IN
Interrupt OUT
Interrupt IN
• DTGLE: Data Toggle
Read-only
0 = Identifies DATA0 packet.
1 = Identifies DATA1 packet.
Refer to Chapter 8 of the Universal Serial Bus Specification, Rev. 2.0 for more information on DATA0, DATA1 packet definitions.
• EPEDS: Endpoint Enable Disable
Read:
0 = Endpoint disabled.
1 = Endpoint enabled.
Write:
0 = Disables endpoint.
1 = Enables endpoint.
Control endpoints are always enabled. Reading or writing this field has no effect on control endpoints.
Note: After reset, all endpoints are configured as control endpoints (zero).
• RXBYTECNT[10:0]: Number of Bytes Available in the FIFO
Read-only
When the host sends a data packet to the device, the USB device stores the data in the FIFO and notifies the microcontroller. The
microcontroller can load the data from the FIFO by reading RXBYTECENT bytes in the UDP_ FDRx register.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
460