UPD72012 datasheet(12/36 Pages) NEC

Part #	UPD72012

Description	HUB CONTROLLER FOR UNIVERSAL SERIAL BUS

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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12

Data Sheet S13918EJ3V0DS

µPD72012

2. DESCRIPTORS

Caution

For a Mask ROM code product, we release the software to make a data for Mask ROM option.

Please contact to Local NEC to get the software if you would like to make Mask ROM code

product.

2.1 Standard Device Descriptor

(1/2)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

0

bLength

1

Shows the size in bytes of the standard device

descriptor.

0x12

1

bDescriptorType

1

Shows that this is a standard device descriptor.

0x01

2bcdUSB

2

Shows that the

µPD72012 compliant with USB

Specifications Revision 1.1.

0x0110

4

bDeviceClass

1

HUB class code defined by USB

(HUB_CLASSCODE=“0x09”).

0x09

5

bDeviceSubClass

1

HUB subclass code defined by USB. Not defined in

HUB class.

0x00

6

bDeviceProtocol

1

Protocol code defined by USB. Not defined in HUB

class.

0x00

7

bMaxPacketSize0

1

Shows the maximum packet size in bytes of

endpoint 0 of the

µPD72012.

0x08

8

idVendor

2

Shows the vendor ID code registered in USB

standards.

For a standard ROM code product (003, 004), this is

“0x0409” (NEC vendor ID).

When using in a Mask ROM code product, set a

vendor ID for each manufacturer registered in USB

standards.

0x0409

0xXXXX

10

IdProduct

2

Shows the product ID code registered in USB

standards.

For a standard ROM code product (003, 004), this is

“0x55AB” (Generic_HUB).

In a Mask ROM code product, this value can be set

as you wish.

0x55AB

0xXXXX

12

bcdDevice

2

Shows the version number of the

µPD72012 using

decimal notation in XX.XX format.

For a standard ROM code product (003, 004), this is

“0x0200” (Ver. 2.0).

When using in a Mask ROM code product, manage

by varying the number for each ROM code.

0x0200

0xXXXX

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UPD72012 Datasheet(PDF) 12 Page - NEC

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