SH7721 datasheet(852/1524 Pages) RENESAS

852 / 1524 page

Section 24

USB Host Controller (USBH)

Rev. 3.00 Jan. 18, 2008 Page 790 of 1458

REJ09B0033-0300

24.3.21

Hc Rh Status Register (USBHRS)

USBHRS is divided into two parts. The lower word of a long word indicates the hub status bits

and the upper word indicates the hub status change bit. Reserved bits should be set to 0.

Bit

Bit Name

Initial

Value

R/W

Description

CRWE

Clear Remote Wakeup Enable

Writing a 1 to this bit clears DeviceRemoteWakeupEnable.

Writing 0 to this bit has no effect.

30 to 18



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

OCIC

R/W

Over Current Indicator Change

This bit is set when the OCI bit changes. Writing 1 clears

this bit. Writing 0 has no effect.

(Read) Local Power Status Change

The root hub does not support the local power status

function. Therefore, this bit is always read as 0.

LPSC

R/W

(Write) Set Global Power

This bit is written to 1 to power on (clears the PPS bit in

USBHRPS) all ports in global power mode (PSM bit in

USBHRDA = 0). This bit sets the PPS bit only to the port

in which the PPCM bit is not set in power mode at each

port. When a 0 is written to, this bit is not cleared.

(Read) Device Remote Wakeup Enable

This bit enables the CSC bit as a resume event and

generates the state transition from USBHSUSPEND1 to

USBRESUME and ResumeDetected interrupt.

0: ConnectStatusChange is not the remote wakeup event

1: ConnectStatusChange is the remote wakeup event.

DRWE

R/W

(Write) Set Remote Wakeup Enable

Writing a 1 sets DeviceRemoteWakeupEnable. Writing a 0

has no effect.

14 to 2



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

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