H8SSLASH2218 datasheet(520/750 Pages) RENESAS

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 472 of 698

REJ09B0074-0600

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

Reserved

These bits are always read as 0 and cannot be

modified.

RWUPs

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

0: Remote wakeup disabled state

1: Remote wakeup enabled state

DVR

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)

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