SH7670 Datasheet, PDF (669/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Initial
Bit
Bit Name
Value R/W Description
8
WKUP
0
R/W Wakeup Output
Enables or disables outputting the remote wakeup
signal (resume signal) to the USB bus when the
function controller function is selected.
0: Remote wakeup signal is not output.
1: Remote wakeup signal is output.
The module controls the output time of a remote
wakeup signal. When this bit is set to 1, this module
clears this bit to 0 after outputting the 10-ms K state.
According to the USB specification, the USB bus idle
state must be kept for 5 ms or longer before a
remote wakeup signal is output. If this module writes
1 to this bit right after detection of suspended state,
the K state will be output after 2 ms.
Note: Do not write 1 to this bit, unless the device
state is in the suspended state (the DVSQ bit in
the INTSTS0 register is set to 1xx) and the
USB host enables the remote wakeup signal.
When this bit is set to 1, the internal clock must
not be stopped even in the suspended state
(write 1 to this bit while SCKE is 1).
This bit should be set to 0 if the host controller
function is selected.
Rev. 1.00 Nov. 14, 2007 Page 643 of 1262
REJ09B0437-0100