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AT43USB355 Datasheet(PDF) 31 Page - ATMEL Corporation |
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AT43USB355 Datasheet(HTML) 31 Page - ATMEL Corporation |
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31 / 115 page  31 AT43USB355 2603G–USB–04/06 USB Interrupt Sources The USB interrupts are described below. All interrupts have individual enable, status, and mask bits through the interrupt enable regis- ter and interrupt mask register. The Suspend and Resume interrupts are cleared by writing a 0 to the particular interrupt bit. All other interrupts are cleared when the microcontroller sets a bit in an interrupt acknowledge register. Table 9. USB Interrupt Sources Interrupt Description SOF Received Whenever USB hardware decodes a valid Start of Frame. The frame number is stored in the two Frame Number Registers. EOF2 Activated whenever the hub's frame timer reaches its EOF2 time point. Function EP0 Interrupt See “Control Transfers at Control End-point EP0” on page 75 for details. Function EP1 Interrupt For an OUT end-point it indicates that Function End-point 1 has received a valid OUT packet and that the data is in the FIFO. For an IN end-point it means that the end-point has received an IN token, sent out the data in the FIFO and received an ACK from the Host. The FIFO is now ready to be written by new data from the microcontroller. Function EP2 Interrupt For an OUT end-point it indicates that Function End-point 2 has received a valid OUT packet and that the data is in the FIFO. For an IN end-point it means that the end-point has received an IN token, sent out the data in the FIFO and received an ACK from the Host. The FIFO is now ready to be written by new data from the microcontroller. Function EP3 Interrupt For an OUT end-point it indicates that Function End-point 3 has received a valid OUT packet and that the data is in the FIFO. For an IN end-point it means that the end-point has received an IN token, sent out the data in the FIFO and received an ACK from the Host. The FIFO is now ready to be written by new data from the microcontroller. Hub EP0 Interrupt See “Control Transfers at Control End-point EP0” on page 75 for details. FRWUP USB hardware has received a embedded function remote wakeup request. GLB SUSP USB hardware has received global suspend signaling and is preparing to put the hub in the suspend mode. The microcontroller's firmware should place the embedded function in the suspend state. RSM USB hardware received resume signaling and is propagating the resume signaling. The microcontroller's firmware should take the embedded function out of the suspended state. BUS RESET USB hardware received a USB bus reset. This applies only in cases where a separation between USB bus reset and microcontroller reset is required. Be very careful when using this feature. |
Similar Part No. - AT43USB355_06 |
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Similar Description - AT43USB355_06 |
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