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AT89C5122D-RDRUM bảng dữ liệu(PDF) 112 Page - ATMEL Corporation

tên linh kiện AT89C5122D-RDRUM
Giải thích chi tiết về linh kiện  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89C5122D-RDRUM bảng dữ liệu(HTML) 112 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Detach Simulation
In order to be re-enumerated by the Host, the AT83R5122, AT8xC5122/23 has the pos-
sibility to simulate a DETACH-ATTACH of the USB bus.
The VREF output voltage is between 3.0V and 3.6V. This output can be connected to the
D+ pull-up as shown in Figure 60. This output can be put in high-impedance when the
DETACH bit is set to 1 in the USBCON register. Maintaining this output in high imped-
ance for more than 3 μs will simulate the disconnection of the device. When resetting
the DETACH bit, an ATTACH is then simulated. The USB controller should be enabled
to use this feature.
Figure 60.
Example of VREF Connection
Figure 61.
Disconnect Timing
D-
D+
D-
D+
GND
VCC
VREF
R1
USB-B Connector
1
2
3
4
R2
R3
D+
D-
V
SS
V
IL
V
IHZ(min)
Device
Disconnected
Disconnect
Detected
>= 2,5
μs



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