UPD72012 datasheet(14/36 Pages) NEC

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Data Sheet S13918EJ3V0DS

µPD72012

2.2 Standard Configuration Descriptor

(1/2)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

bLength

Shows the size in bytes of the standard

configuration descriptor.

0x09

bDescriptorType

Shows that this is a standard configuration

descriptor.

0x02

wTotalLength

Shows the total length of descriptors returned on a

host Get_Descriptor (Configuration) request

(standard configuration, standard interface, each

standard endpoint, and HUB class descriptors).

0x0019

bNumInteface

Shows the number of interfaces that can be set in

this configuration.

Its value is fixed at “0x01” for the

µPD72012.

0x01

bConfigurationValue

Specifying this value in a Set_Configuration request

from the host sets this configuration in the

µPD72012.

0x01

iConfiguration

Shows the index of the string descriptor for a

comment about the configuration of a product using

the HUB.

Since not used for a standard ROM code product

(003, 004), its value is “0x00”.

When using this for a Mask ROM code product, set it

to “0x04”.

0x00

0x04

bmAttributes

Uses a bitmap to show the power supply attributes

of this configuration of the

µPD72012.

Caution Since the information “Self-power” in

the status returned on a Get_Status

request from the host reflects the level

input to the PSSEL pin, be sure that

there are no inconsistencies.

“0xE0”: Corresponds to both “bus power” and “self-

power” modes and shows that “Remote Wakeup” is

supported. A standard ROM code product has this

setting.

Use this setting when using in “self-power” mode

only or when switching between “bus power” and

“self-power” by performing a PSSEL pin function.

“0xA0”: Corresponds to “bus power” mode only and

shows that “Remote Wakeup” is supported.

Make this setting when using in “bus power” mode

only.

0xE0

0xA0

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