參數(shù)資料
型號(hào)： UPD72012GB-004
廠商： NEC Corp.
英文描述： HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
中文描述： 集線器控制器通用串行總線
文件頁(yè)數(shù)： 18/36頁(yè)
文件大小： 414K
代理商： UPD72012GB-004
18
Data Sheet S13918EJ3V0DS
μ
PD72012
(2/4)
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
Mask
ROM code
product
3
wHubCharacteristics
2
Uses a bitmap to show attributes of the
μ
PD72012.
The meaning of each bit is as follows.
Bits 1,0: Show the power switch switching attribute.
“0b00”: Enable all power switches at once.
This is the value for a standard ROM code
product (004).
If this value is set for a Mask ROM code
product, all of pins PP1 to PP5 operate at
once.
“0b01”: Enable power switches individually for
each port.
This is the value for a standard ROM code
product (003).
If this value is set for a Mask ROM code
product, pins PP1 to PP5 operate
individually.
“0b1X”: Reserved. Used only on 1.0 compliant
hubs that implement no power switching.
You can not use this setting for
μ
PD72012.
Bit 2:
Identifier of a compound device. Set this
to “0b0” when using the
μ
PD72012 as a
unit HUB and to “0b1” when using it as
compound devices.
“0b0”:
Shows that the
μ
PD72012 is standalone
HUB unit.
“0b1”:
Shows that
μ
PD72012 is a part of
compound devices.
Bits 4,3: Show the overcurrent protection switching
attribute.
“0b00”: Monitor overcurrent for all ports in a batch.
Since this is the value for a standard ROM
code product (004), a circuit that can
control all overcurrent protection functions
at once externally is needed.
If this value is set for a Mask ROM code
product, when one of the pins CS1 to CS5
detect overcurrent, Hub reports
overcurrent on per- hub basis.
0x0009
0x0000
0x00XX
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