r8a66597 Renesas Electronics Corporation., r8a66597 Datasheet - Page 99

• Manufacturer Part Number: r8a66597
• Description: Assp Usb2.0 2 Port Host/1 Port Peripheral Controller
• Manufacturer: Renesas Electronics Corporation.

R8A66597FP/DFP/BG
2.17.7 Clear bit of sequence toggle bit (SQCLR)
2.17.8 Write bit of sequence toggle bit (SQSET)
2.17.9 Monitor bit of sequence toggle bit (SQMON)
2.17.10 Pipe busy bit (PBUSY)
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If the software writes "1" to this bit, the controller writes the expected value of the sequence toggle bit of the pipe to
DATA0. The controller always sets "0" to this bit.
When the Host Controller function is selected, if "1" is written to this bit for the Bulk-Out transfer pipe, the controller
starts the next transfer of the pipe from the PING-token. Not write "1" to the SQCLR bit except when "CSSTS=0" and
"PID=NAK". To write "1" to this bit after the PID bit of the PIPE is modified from "BUF" to "NAK", check that "CSSTS=0"
and "PBUSY=0" and then modify the bit. However, when the controller has modified the PID bit to "NAK", it is not
necessary to check the PBUSY bit.
If the software writes "1" to this bit, the controller sets the expected value sequence toggle bit of the pipe to DATA1.
The controller always sets "0" to this bit.
Not write "1" to the SQSET bit except when "CSSTS=0" and "PID=NAK". To write "1" to this bit after the PID bit of the
PIPE is modified from "BUF" to "NAK", check that "CSSTS=0" and "PBUSY=0", and then modify the bit. However,
when the controller has modified the PID bit to "NAK", it is not necessary to check the PBUSY bit.
In this bit, the controller displays the expected value of the sequence toggle bit of the pipe.
If the selected pipe other than transfer type isochronous, the controller toggles this bit if the transaction is executed
normally. However, this bit is not toggled if there is a DATA-PID mismatch during reception direction transfer.
The controller modifies this bit from "0" to "1" when the USB transaction of the pipe is started. When one transaction is
completed, the bit is modified from "1" to "0".
When the software has set "PID=NAK", possibility of pipe modification can be checked by reading this bit.
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