AT83C5136-RDTUL datasheet(119/171 Pages) ATMEL

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119

AT83C5134/35/36

7683B–USB–03/07

Detach Simulation

In order to be re-enumerated by the Host, the AT83C5134/35/36 has the possibility 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.

Figure 60. Example of VREF Connection

Figure 61. Disconnect Timing

USB Interrupt System

Interrupt System Priorities

Figure 62. USB Interrupt Control System

D-

D+

D-

D+

GND

REF

1.5 kΩ

USB-B Connector

AT89C5131

D+

D-

IHZ(min)

Device

Disconnected

Disconnect

Detected

> = 2,5 µs

EUSB

IE1.6

IE0.7

USB

Controller

IPH/L

Interrupt Enable

Lowest Priority Interrupts

Priority Enable

D+

D-

AT83C5136-RDTUL 数据表(PDF) 119 Page - ATMEL Corporation

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