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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AT89C5122D-RDRUM Datenblatt(PDF) 112 Page - ATMEL Corporation |
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AT89C5122D-RDRUM Datenblatt(HTML) 112 Page - ATMEL Corporation |
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112 / 208 page  112 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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