UPD72012 View Datasheet(PDF) - NEC => Renesas Technology
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UPD72012 Datasheet PDF : 36 Pages
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µPD72012
2.2 Standard Configuration Descriptor
No.
Field
Size
(Bytes)
Contents
Value
(1/2)
Standard ROM code
product
003
004
Mask
ROM code
product
0 bLength
1 Shows the size in bytes of the standard
configuration descriptor.
0x09
0x09
0x09
1 bDescriptorType
1 Shows that this is a standard configuration
descriptor.
0x02
0x02
0x02
2 wTotalLength
2 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 0x0019 0x0019
4 bNumInteface
1 Shows the number of interfaces that can be set in
this configuration.
Its value is fixed at “0x01” for the µPD72012.
0x01
0x01
0x01
5 bConfigurationValue
1 Specifying this value in a Set_Configuration request
from the host sets this configuration in the
µPD72012.
0x01
0x01
0x01
6 iConfiguration
1 Shows the index of the string descriptor for a
0x00
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
0x00
or
0x04
7 bmAttributes
1 Uses a bitmap to show the power supply attributes
of this configuration of the µPD72012.
0xE0
0xE0
0xE0
or
0xA0
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.
14
Data Sheet S13918EJ3V0DS
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