參數(shù)資料
型號(hào)： uPSD3234
廠(chǎng)商： 意法半導(dǎo)體
英文描述： Flash Programmable System Device with 8032 Microcontroller Core(嵌入高速“8032微控制器核”的Flash型可編程系統(tǒng)器)
中文描述： 閃存可編程系統(tǒng)器件與8032微控制器內(nèi)核（嵌入高速“8032微控制器核”的閃存型可編程系統(tǒng)器）
文件頁(yè)數(shù)： 15/54頁(yè)
文件大?。?/td> 736K
代理商： UPSD3234
15/54
AN1886 - APPLICATION NOTE
Table 14. Components of a SET_Report Request
USB Descriptors
USB devices report their attributes using descriptors. A descriptor is a data structure with a specific format.
Each descriptor begins with a byte-wide field that contains the total number of bytes in the descriptor, fol-
lowed by a byte-wide field that identifies the descriptor type. Using descriptors allows concise storage of
the attributes of individual configurations because each configuration may reuse descriptors or portions of
descriptors from other configurations that have the same characteristics. In this manner, the descriptors
resemble individual data records in a relational database. Where appropriate, descriptors contain refer-
ences to string descriptors that provide displayable information describing a descriptor in human-readable
form. The inclusion of string descriptors is optional. However, the reference fields within descriptors are
mandatory. If a device does not support string descriptors, string reference fields must be reset to zero to
indicate that no string descriptor is available. If a descriptor returns with a value in its length field that is
less than that defined by this specification, the descriptor is invalid, and should be rejected by the host. If
the descriptor returns with a value in its length field that is greater than that defined by this specification,
the host ignores the extra bytes, but the next descriptor is located using the length returned rather than
the length expected.
Figure 4. USB and HID Descriptor Structure
Part
Description
bmRequestType
0010 0001 (0x21) - CLASS_INTERFACE_TO_DEVICE
bRequest
SET_REPORT (0x09)
wValue
Report Type and Report ID
wIndex
Interface
wLength
Report Length
Data
Report
AI09096
Device
Descriptor
Configuration
Descriptor
Interface
Descriptor
Endpoint
Descriptor
HID
Descriptor
Report
Descriptor
Physical
Descriptor
String
Descriptor
相關(guān)PDF資料
PDF描述
uPSD3251(中文) Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設(shè)備)
uPSD3251 Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設(shè)備)
uPSD3253AV-24T1T Flash Programmable System Devices with 8032 Microcontroller Core
UPSD3253B Two and Three Channel Codewheels
UPSD3253BV Flash Programmable System Devices with 8032 Microcontroller Core
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPSD32348V24V6ES 制造商:ST MICRO 功能描述:*
UPSD3234A 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core
UPSD3234A-24T1 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core
UPSD3234A-24T1T 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
UPSD3234A-24T6 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core
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