H8S15 Datasheet, PDF (612/904 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

Section 15 Universal Serial Bus Interface (USB)
H8S/2215 Group
(2) Data Stage (Control-In)
The firmware 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 in-
transfer, one packet of data to be sent to the host is written to the FIFO. If there is more data to be
sent, this data is written to the FIFO after the data written first has been sent to the host (EP0iTS of
UIFR0 is set to 1).
The end of the data stage is identified when the host transmits an OUT token and the status stage
is entered.
Page 558 of 846
REJ09B0140-0900 Rev. 9.00
Sep 16, 2010