HD6417727BP160CV Datasheet, PDF (812/1098 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/ SH7700 Series

Section 24 USB HOST Module
Register: HcRhPortStatus[1:2]
Bits
Reset R/W
8
1
R/W
7–5
0h
—
4
0
R/W
Offset: 54–57, 58–5B
Description
(read) PortPowerStatus (PPS)
This bit reflects the power state of the port regardless of the
power switching mode to be executed.
However, because the initial value of the No Power Switching
bit of the HcRhDescriptorA register is 1, this bit is first fixed to 1.
No Power Switching bit must first be cleared before the power is
switched, as shown below.
When an over-current condition is detected, this bit is cleared.
Writing SetPortPower or SetGlovalPower sets this bit. Writing
ClearPortPower or ClearGlobalPower clears this bit.
PowerSwitchingMode and PortPowerControlMask determine
which power control switch can be used. Only
Set/ClearGlobalPower controls this bit in global switching mode
(PowerSwitchingMode= 0). If the PortPowerControlMask bit of
that port is set in power switching mode (PowerSwitchingMode
= 1). Only the Set/ClearGlobalPower command is enabled if the
mask is not set. When the port power is disabled,
CurrentConnectStatus, PortEnableStatus, PortSuspendStatus,
and portResetStatus are reset.
0 = Port power is off.
1 = Port power is on. (initial value)
Note: If NoPowerSwitching is set, this bit is always read as 1.
(write) SetPortPower
Writing a 1 sets PortPowerStatus. Writing a 0 has no effect.
Reserved.
(read) PortResetStatus (PRS)
When this bit is set by writing to SetPortReset, the port reset
signal is output. This bit is cleared when
PortResetStatusChange is set upon completion of a reset.
When CurrentConnectStatus is cleared, this bit is not set.
0 = Port reset signal is not active. (initial value)
1 = Port reset signal is active.
(write) SetPortReset
Writing a 1 sets PortReset signal. Writing a 0 has no effect.
When CurrentConnectStatus is cleared, this write does not set
PortResetStatus, instead, sets ConnectStatusChange. This
reports a reset of the power disconnection port to the driver.
Rev.6.00 Mar. 27, 2009 Page 754 of 1036
REJ09B0254-0600