SH7670 Datasheet, PDF (755/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Bit
Bit Name
11 to 3 
2 to 0 IITV[2:0]
Section 17 USB 2.0 Host/Function Module (USB)
Initial
Value R/W
All 0 R
000 R/W
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
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 while CSSTS is 0 and PID is NAK
and before the pipe is selected 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 through software 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.
Rev. 1.00 Nov. 14, 2007 Page 729 of 1262
REJ09B0437-0100