Section 22 USB Function Module (USB)
Rev. 1.00 Mar. 12, 2008 Page 887 of 1178
REJ09B0403-0100
22.8.2
DTC Transfer for Endpoint 1
When the data received at EP1 is transferred by the DTC, the USB function module automatically
performs the same processing as writing 1 to the RDFN bit in TRG if the currently selected FIFO
becomes empty. Accordingly, in DTC transfer, do not write 1 to the RDFN bit in TRG. If the user
writes 1 to the RDFN bit in DTC transfer, correct operation cannot be guaranteed.
To end the DTC transfer, write 0 to the EP1FULL bit in IFR0, after clearing the EP1DMAE bit in
DMA to 0 within the processing routine for a DTC transfer end interrupt. If this procedure is
omitted, the DTC transfer end interrupt is not cleared. To perform the DTC transfer again, in
addition to the said procedure, set the number of transfers in the DTC, set the interrupt source, and
then set the EP1DMAE bit in DMA to 1.
Figure 22.20 shows an example of receiving 150 bytes of data from the host. In this case, internal
processing which is the same as writing 1 to the RDFN bit in TRG is automatically performed
three times. This internal processing is performed when the currently selected data FIFO becomes
empty. Accordingly, this processing is automatically performed both when 64-byte data is sent
and when data less than 64 bytes is sent.
RDFN
(Automatically
performed)
RDFN
(Automatically
performed)
RDFN
(Automatically
performed)
64 bytes
64 bytes
22 bytes
Figure 22.20 RDFN Bit Operation for EP1
Summary of Contents for H8S Family
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Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
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Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
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Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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