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AT90USB646 Datasheet(PDF) 289 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 289 Page - ATMEL Corporation |
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289 / 456 page  289 7593L–AVR–09/12 AT90USB64/128 24.12 Control pipe management A Control transaction is composed of three phases: • SETUP • Data (IN or OUT) • Status (OUT or IN) The firmware has to change the Token for each phase. The initial data toggle is set for the corresponding token (ONLY for Control Pipe): • SETUP: Data0 • OUT: Data1 • IN: Data1 (expected data toggle) 24.13 OUT pipe management The Pipe must be configured and not frozen first. Note: if the firmware decides to switch to suspend mode (clear SOFEN) even if a bank is ready to be sent, the USB controller will automatically exit from Suspend mode and the bank will be sent. The TXOUT bit is set by hardware when the current bank becomes free. This triggers an inter- rupt if the TXOUTE bit is set. The FIFOCON bit is set at the same time. The CPU writes into the FIFO and clears the FIFOCON bit to allow the USB controller to send the data. If the OUT Pipe is composed of multiple banks, this also switches to the next data bank. The TXOUT and FIFOCON bits are automatically updated by hardware regarding the status of the next bank. |
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