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数据搜索系统，热门电子元器件搜索 |
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AT89C5131A-RDTIL 数据表(PDF) 133 Page - ATMEL Corporation |
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AT89C5131A-RDTIL 数据表(HTML) 133 Page - ATMEL Corporation |
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133 / 186 page  133 AT89C5131A-L 4338F–USB–08/07 Detach Simulation In order to be re-enumerated by the Host, the AT89C5131A-L has the possibility to sim- ulate 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 68. 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 68. Example of VREF Connection Figure 69. Disconnect Timing USB Interrupt System Interrupt System Priorities Figure 70. USB Interrupt Control System D- D+ D- D+ GND V CC V REF 1.5 kΩ 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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