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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 771 of 982
REJ09B0023-0400
Data Stage (Control-OUT): The application first analyzes command data from the host in the
setup stage, and determines the subsequent data stage direction. If the result of command data
analysis is that the data stage is OUT-transfer, the application waits for data from the host, and
after data is received (USBIFR0/EP0oTS = 1), reads data from the FIFO. Next, the application
writes 1 to the EP0o read complete bit, empties the receive FIFO, and waits for reception of the
next data.
The end of the data stage is identified when the host transmits an IN token and the status stage is
entered.
USB function
Application
OUT token reception
Data reception from host
OUT token reception
Set EP0o reception
complete flag
(USBIFR0/EP0o TS = 1)
Clear EP0o reception
complete flag
(USBIFR0/EP0o TS = 0)
Read data from USBEP0o
receive data size register
(USBEPSZ0o)
Write 1 to EP0o read
complete bit
(USBTRG/EP0o RDFN = 1)
Read data from USBEP0o
data register (USBEPDR0o)
1 written
to USBTRG/EP0s
RDFN?
1 written
to USBTRG/EP0o
RDFN?
NACK
NACK
ACK
No
Yes
No
Yes
Interrupt request
Figure 20.7 Data Stage (Control-OUT) Operation
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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