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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT83C5136-RDTUL 데이터시트(PDF) 119 Page - ATMEL Corporation |
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AT83C5136-RDTUL 데이터시트(HTML) 119 Page - ATMEL Corporation |
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119 / 171 page  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 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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