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AT89C5131A-RDTIM датащи(PDF) 134 Page - ATMEL Corporation

номер детали AT89C5131A-RDTIM
подробное описание детали  8-bit Flash Microcontroller with Full Speed USB Device
PDF  184 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131A-RDTIM датащи(HTML) 134 Page - ATMEL Corporation

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134
AT89C5130A/31A-M
4337C–USB–02/05
Detach Simulation
In order to be re-enumerated by the Host, the AT89C5130A/31A-M has the possibility to
simulate a DETACH - ATTACH of the USB bus.
The V
REF output voltage is between 3.0V and 3.6V. This output can be connected to the
D+ pull-up as shown in Figure 65. 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.
Figure 65. Example of V
REF Connection
Figure 66. Disconnect Timing
USB Interrupt System
Interrupt System Priorities
Figure 67. USB Interrupt Control System
D-
D+
D-
D+
GND
V
CC
V
REF
1.5 k
Ω
USB-B Connector
1
2
3
4
AT89C5131
D+
D-
V
SS
V
IL
V
IHZ(min)
Device
Disconnected
Disconnect
Detected
> = 2,5
µs
EUSB
IE1.6
EA
IE0.7
USB
Controller
IPH/L
Interrupt Enable
Lowest Priority Interrupts
Priority Enable
00
01
10
11
D+
D-



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