Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
REJ09B0140-0900 Rev. 9.00 Page 507 of 846
Sep 16, 2010
H8S/2215 Group
15.3.4 USB Device Resume Register (UDRR)
UDRR indicates remote wakeup according to the host enable/disable state and enables or disables
remote wakeup of the USB modules in the suspend state.
Bit Bit Name Initial Value R/W Description
7 to 2 — All 0 R Reserved
These bits are always read as 0 and cannot be
modified.
1 RWUPs 0 R Remote Wakeup Status
Indicates the enabled or disabled state of remote
wakeup by the host. This bit is a status bit and cannot
be written to. If the remote wakeup from the host is
disabled by Device_Remote_Wakeup through the
Set_Feature/Clear_Feature request, this bit is cleared
to 0. If the remote wakeup is enabled, this bit is set to
1.
0: Remote wakeup disabled state
1: Remote wakeup enabled state
0 DVR 0 W Device Resume
Cancels suspend state (remote wakeup execution).
This bit can be written to 1 and is always read as 0.
Before executing remote wakeup, software standby
mode or USB module stop mode must be cancelled to
provide a clock for the USB module.
0: Performs no operation
1: Cancels suspend state (executes remote wakeup)