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UPD72012CU-XXX Datasheet(PDF) 12 Page - NEC |
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UPD72012CU-XXX Datasheet(HTML) 12 Page - NEC |
12 / 36 page 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 0x12 0x12 1 bDescriptorType 1 Shows that this is a standard device descriptor. 0x01 0x01 0x01 2bcdUSB 2 Shows that the µPD72012 compliant with USB Specifications Revision 1.1. 0x0110 0x0110 0x0110 4 bDeviceClass 1 HUB class code defined by USB (HUB_CLASSCODE=“0x09”). 0x09 0x09 0x09 5 bDeviceSubClass 1 HUB subclass code defined by USB. Not defined in HUB class. 0x00 0x00 0x00 6 bDeviceProtocol 1 Protocol code defined by USB. Not defined in HUB class. 0x00 0x00 0x00 7 bMaxPacketSize0 1 Shows the maximum packet size in bytes of endpoint 0 of the µPD72012. 0x08 0x08 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 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 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 0x0200 0xXXXX |
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