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Section 26 USB 2.0 Host/Function Module
Page 1442 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
11 to 3 All 0 R Reserved
These bits are always read as 0. The write value
should always be 0.
2 to 0 IITV[2:0] 000 R/W Interval Error Detection Interval
Specifies the interval error detection timing for the
selected pipe in terms of frames, which is expressed
as n-th power of 2 (n is the value to be set).
As described later, the detailed functions are
different in host controller mode and in function
controller mode.
Modify these bits when the value of CSSTS is 0, the
PID bits are set to NAK, and no pipe is specified by
the CURPIPE bits.
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.
Before modifying these bits after USB
communication has been completed with these bits
set to a certain value, set PID to NAK and then set
ACLRM to 1 to initialize the interval timer.
The IITV bits are invalid for PIPE3 to PIPE5; set
these bits to 000 for these pipes.