UPD72012 datasheet(18/36 Pages) NEC

18 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

(2/4)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

wHubCharacteristics

Uses a bitmap to show attributes of the

µPD72012.

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

µPD72012.

Bit 2:

Identifier of a compound device. Set this

to “0b0” when using the

µPD72012 as a

unit HUB and to “0b1” when using it as

compound devices.

“0b0”:

Shows that the

µPD72012 is standalone

HUB unit.

“0b1”:

Shows that

µPD72012 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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