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Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1423 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
6 SQMON 1 R Sequence Toggle Bit Monitor
Indicates the expected value of the sequence
toggle bit for the next transaction during the DCP
transfer.
0: DATA0
1: DATA1
This module allows this bit to toggle upon normal
completion of the transaction. However, this bit is
not allowed to toggle when a DATA-PID
disagreement occurs during the transfer in the
receiving direction.
When the function controller function is selected,
this module sets this bit to 1 (specifies DATA1 as
the expected value) upon normal reception of the
setup packet.
When the function controller function is selected,
this module does not reference to this bit during the
IN/OUT transaction of the status stage, and does
not allow this bit to toggle upon normal completion.
5 PBUSY 0 R Pipe Busy
This bit indicates whether or not a transaction using
the pertinent pipe is currently in progress.
0: The pertinent pipe is not in use by a transaction.
1: The pertinent pipe is in use by a transaction.
The USB 2.0 host/function module changes the
setting of the PBUSY bit from 0 to 1 when a USB
transaction using the DCP starts. It clears the
PBUSY bit from 1 to 0 when one transaction
completes successfully.
Reading this bit after setting PID to NAK allows
checking that modification of the pipe settings is
possible.
For details, refer to section 26.4.3 (1), Pipe Control
Register Switching Procedures.