Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD データシート

1035

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14



This flag generates an interrupt while it is set to one.
Read:
0: No setup packet available.
1: A setup data packet has been sent by the host and is available in the FIFO.
Write:
0: Device firmware notifies the USB peripheral device that it has read the setup data in the FIFO.
1: No effect.
This flag is used to notify the USB device firmware that a valid Setup data packet has been sent by the host and success-

fully received by the USB device. The USB device firmware may transfer Setup data from the FIFO by reading the 

UDP_FDRx to the microcontroller memory. Once a transfer has been done, RXSETUP must be cleared by the device 

firmware.
Ensuing Data OUT transaction is not accepted while RXSETUP is set.



This flag generates an interrupt while it is set to one.
This ends a STALL handshake.
Read:
0: Host has not acknowledged a stall
1: Host has acknowledged the stall
Write:
0: Resets the STALLSENT flag, clears the interrupt
1: No effect
This is mandatory for the device firmware to clear this flag. Otherwise the interrupt remains.
Refer to chapters 8.4.5 and 9.4.5 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the STALL 

handshake.



This flag is cleared by the USB device.
This flag is set by the USB device firmware.
Read:
0: There is no data to send.
1: The data is waiting to be sent upon reception of token IN.
Write:
0: Can be used in the procedure to cancel transmission data. (See 

1: A new data payload has been written in the FIFO by the firmware and is ready to be sent.
This flag is used to generate a Data IN transaction (device to host). Device firmware checks that it can write a data payload 

in the FIFO, checking that TXPKTRDY is cleared. Transfer to the FIFO is done by writing in the UDP_FDRx. Once the data 

payload has been transferred to the FIFO, the firmware notifies the USB device setting TXPKTRDY to one. USB bus trans-

actions

 

can start. TXCOMP is set once the data payload has been received by the host.