HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 576

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

19.3.21 HcRhStatus Register (HRSR)
HRSR is divided into two parts. The lower word of a longword indicates the hub status bits and
the upper word indicates the hub status change bit. The reserved bits should be set to 0.
Rev. 1.00, 02/04, page 538 of 804
Bit
31
30 to 18 —
17
16
15
Bit Name
CRWE
OCIC
LPSC
DRWE
Initial
Value
0
All 0
0
0
0
R/W
W
R
R/W
R/W
R/W
Description
Clear Remote Wakeup Enable
Writing 1 clears this bit. When this bit is set to 0, this bit is
not cleared.
Reserved
These bits are always read as 0. The write value should
always be 0. The operation is not guaranteed if 1 is
written to these bits.
Over Current Indicator Change
When the OCI field in this register is changed, this bit is
set by the host controller. Writing 1 by the host controller
driver clears this bit. When this bit is set to 0, this bit is
not cleared.
(Read) Local Power Status Change
The root hub does not support the local power status
function. Therefore, this bit is always read as 0.
(Write) Set Global Power
This bit is written to 1 to power on (sets the PPS bit in the
HcRhPortStatus register) all ports in global power mode
(PSM bit in the HcRhDescriptorA register = 0). This bit
sets the PPS bit only to the port in which the PPCM bit in
the HcRhDescriptorB register is not set in power mode at
each port. When 0 is written to, this bit is not cleared.
(Read) Device Remote Wakeup Enable
This bit enables the CSC bit in the HcRhPortStatus
register as a resume event and generates the state
transition from USB Suspend to USB Resume and the
Resume Detected interrupt.
0: Connect Status Change is not the Remote Wakeup
1: Connect Status Change is the Remote Wakeup event.
(Write) Set Remote Wakeup Enable
Writing 1 sets this bit. When 0 is written to, this bit is not
set.
event.