Datasheet

Section 14 Universal Serial Bus (USB)
Rev.7.00 Dec. 24, 2008 Page 510 of 698
REJ09B0074-0700
(4) Status Stage (Control-In)
The control-in status stage starts with an OUT token from the host. The firmware receives 0-
byte data from the host, and ends control transfer.
USB function Firmware
OUT token reception
0-byte reception from host
End of control transfer
Set EP0o reception
complete flag
(UIFR0/EP0oTS = 1)
Clear EP0o reception
complete flag
(UIFR0/EP0oTS = 0)
Write 1 to EP0o read
complete bit
(UTRG0/EP0oRDFN = 1)
End of control transfer
ACK
EXIRQx
Figure 14.15 Status Stage Operation (Control-In)