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Section 26 USB 2.0 Host/Function Module
Page 1434 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
7 SHTNAK 0 R/W Pipe Disabled at End of Transfer
Specifies whether to modify PID to NAK upon the
end of transfer when the selected pipe is in the
receiving direction.
0: Pipe continued at the end of transfer
1: Pipe disabled at the end of transfer
This bit is valid when the selected pipe is PIPE1 to
PIPE5 in the receiving direction.
When this bit has been set to 1 for the selected pipe
in the receiving direction, this module modifies the
PID bits corresponding to the selected pipe to NAK
on determining the end of the transfer. This module
determines that the transfer has ended on any of the
following conditions.
A short packet (including a zero-length packet) is
successfully received.
The transaction counter is used and the number
of packets specified by the counter are
successfully received.
Modify these bits while CSSTS is 0 and PID is NAK.
Before modifying these bits after modifying the PID
bits for the selected pipe from BUF to NAK, check
that CSSTS and PBUSY are 0. However, if the PID
bits have been modified to NAK by this module,
checking PBUSY is not necessary.
This bit should be cleared to 0 for the pipe in the
transmitting direction.
6, 5 All 0 R Reserved
These bits are always read as 0. The write value
should always be 0.