HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 580

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

Rev. 1.00, 02/04, page 542 of 804
Bit
8
7 to 5
Bit Name
PPS
—
Initial
Value
1
All 0
R/W
R/W
R
Description
(Read) Port Power Status
This bit reflects the power status of the port regardless of
power switching mode to be executed. However, because
the initial value of the No Power Switching bit in the
HcRhDescriptorA register is 1, this bit is first fixed to 1.
The No Power Switching bit must first be cleared when
power is switched, as shown below.
When an overcurrent condition is detected, this bit is
cleared. Writing Set Port Power or Set Global Power by
the host controller driver sets this bit. Also, writing Clear
Port Power or Clear Global Power by the host controller
driver clears this bit.
The PSM bit in the HcRhDescriptorA register and the
PPCM bit in the HcRhDescriptorB register determine
which power control switch can be used. Only Set/Clear
Global Power controls this bit in global switching mode
(PSM bit = 0). If the PPCM bit of that port is set in power
switching mode (PSM bit = 1), only the Set/Clear Port
Power command is enabled. If the mask is not set, only
the Set/Clear Global Power command is enabled. When
the port power is disabled, the CCS, PES, PSS, and PRS
bits are reset.
Note: If power switching mode is not supported, this bit is
0: Port power is off.
1: Port power is on.
(Write) Set Port Power
Writing 1 by the host controller driver sets the PPS bit.
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.
When this bit is written to 0, this bit is not set.
always read as 1.