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UPD72012 View Datasheet(PDF) - NEC => Renesas Technology

Part Name
Description
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UPD72012
NEC
NEC => Renesas Technology NEC
UPD72012 Datasheet PDF : 36 Pages
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µPD72012
2.4 Standard Endpoint Descriptor 1
No.
Field
0 bLength
1 bDescriptorType
2 bEndpointAddress
3 bmAttributes
4 wMaxPacketSize
6 bInterval
Size
(Bytes)
Contents
Value
Standard ROM code
product
003
004
Mask
ROM code
product
1 Shows the size in bytes of standard endpoint
descriptor 1.
0x07
0x07
0x07
1 Shows that this is a standard endpoint descriptor.
0x05
0x05
0x05
1 Shows the EndpointAddress of endpoint 1.
0x81
0x81
0x81
1 Shows the attributes of endpoint 1
(Interrupt=“0x03”).
0x03
0x03
0x03
2 Shows the maximum packet size of endpoint 1.
0x0001 0x0001 0x0001
1 For an Interrupt attribute endpoint, shows the polling 0xFF
time in milliseconds using hexadecimal notation. For
a HUB, the maximum value that can be set (“0xFF”)
is entered.
0xFF
0xFF
2.5 HUB Class Descriptor
No.
Field
Size
(Bytes)
Contents
Value
(1/4)
Standard ROM code
product
003
004
Mask
ROM code
product
0 bDescLength
1 Shows the size in bytes of the HUB class descriptor. 0x09
0x09
0x09
1 bDescriptorType
1 Shows that this is a HUB class descriptor.
0x29
0x29
0x29
2 bNbrPort
1 Shows the number of downstream ports the HUB
0x04
0x04
0xXX
supports in a set.
(PVSEL=“L”) (PVSEL=“L”) (PVSEL=“L”)
For a standard ROM code product (003, 004), the
or
or
or
value varies according to the PVSEL pin setting.
0x05
0x05
0xYY
It is “0x05” for a 5-port HUB (PVSEL=“H”), and
(PVSEL=“H”) (PVSEL=“H”) (PVSEL=“H”)
“0x04” for a 4-port HUB (PVSEL=“L”).
For a Mask ROM code product, the value in this field
can be set arbitrarily. Since two-way setting by
switching the PVSEL input level is possible for these
values, perform two-way specification. Note that the
values that are set for PVSEL=“H” are from “0x01” to
“0x05”, and the values that are set for PVSEL=“L”
are from “0x01” to “0x04”. The µPD72012 enables
ports in turn starting from the smallest port number.
Data Sheet S13918EJ3V0DS
17
 

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