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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89C5131A-RDTIL 데이터시트(PDF) 133 Page - ATMEL Corporation |
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AT89C5131A-RDTIL 데이터시트(HTML) 133 Page - ATMEL Corporation |
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133 / 185 page  133 AT89C5131A-L 4338E–USB–06/06 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 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 67. 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 67. Example of V REF Connection Figure 68. Disconnect Timing USB Interrupt System Interrupt System Priorities Figure 69. 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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