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Section 26 USB 2.0 Host/Function Module
Page 1414 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
26.3.27 USB Request Length Register (USBLENG)
USBLENG is a register that stores setup requests for control transfers. When the function
controller function is selected, the value of wLength that has been received is stored. When the
host controller function is selected, the value of wLength to be transmitted is set.
This register is initialized by a power-on reset or a USB bus reset.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit:
Initial value:
R/W:
0000000000000000
R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W*
WLENGTH[15:0]
Bit Bit Name
Initial
Value
R/W Description
15 to 0 WLENGTH
[15:0]
H'0000 R/W* Length
These bits store the USB request wLength value.
(1) When the host controller function is selected
The USB request wLength value for the setup
transaction to be transmitted should be set in
these bits. After setting SUREQ to 1, do not
modify these bits until 0 is read from SUREQ.
(2) When the function controller function is selected
Indicates the USB request wLength value
received during the setup transaction. Writing to
these bits is invalid.
Note: * When the function controller function is selected, these bits can only be read, and
writing to these bits is invalid. When the host controller function is selected, these bits
can be read and written to.