Datasheet

Section 14 Universal Serial Bus (USB)
Rev.7.00 Dec. 24, 2008 Page 472 of 698
REJ09B0074-0700
14.3.3 USB Device Resume Register (UDRR)
UDRR indicates the enabled or disabled state of remote wakeup by the host, and executes the
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 the suspend state (executes the remote
wakeup). This bit can be written to 1 and is always
read as 0. Before executing the remote wakeup,
power-down mode or USB module stop mode must be
cancelled to provide a clock for the USB module.
0: Performs no operation
1: Cancels the suspend state (executes the remote
wakeup)