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AT43USB353M Datasheet(PDF) 62 Page - ATMEL Corporation |
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AT43USB353M Datasheet(HTML) 62 Page - ATMEL Corporation |
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62 / 95 page ![]() 62 AT43USB353M 3307B–USB–4/04 Control Write Status Response State The Function Interface Unit receives an IN token from the Host. The FIU responds with a zero length DATA1 packet, retrying until it receives an ACK back from the Host. The FIU then asserts a TX_COMPLETE interrupt. Hardware Firmware 1. IN token from Host 2. Send DATA1(0) 3. ACK from Host 4. Set TX Complete → INT 5. Read UISR 6. Read CSR0 7. Clear TX COMPLETE, clear Data End, set Force STALL in CAR0 8. Set UIAR[EP0 INTACK] to clear the interrupt source |
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