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Section 19 Serial Communication Interface with FIFO (SCIF)
Rev. 4.00 Sep. 14, 2005 Page 742 of 982
REJ09B0023-0400
19.5
SCIF Interrupts and DMAC
The SCIF has four interrupt sources: transmit-FIFO-data-empty (TXI), receive-error (ERI),
receive-data-full (RXI), and break (BRI).
Table 19.11 shows the interrupt sources and their order of priority. The interrupt sources are
enabled or disabled by means of the TIE, RIE, and REIE bits in SCSCR. A separate interrupt
request is sent to the interrupt controller for each of these interrupt sources.
When TXI request is enabled by TIE bit and the TDFE flag in the serial status register (SCFSR) is
set to 1, a TXI interrupt request and transmit FIFO data empty DMA transfer request are
generated. When TXI request is disabled by TIE bit and the TDFE flag is set to 1, transmit FIFO
data empty DMA transfer request is generated. The DMAC can be activated and data transfer
performed by the transmit FIFO data empty DMA transfer request.
When RXI request is enabled by RIE bit and the RDF or DR flag in SCFSR is set to 1, an RXI
interrupt request and receive FIFO data full DMA transfer request are generated. When RXI
request is disabled by RIE bit and the RDF or DR flag in SCFSR is set to 1, receive FIFO data full
DMA transfer request is generated. The DMAC can be activated and data transfer performed by
the receive FIFO data full DMA transfer request. The RXI interrupt request or receive FIFO data
full DMA transfer request caused by DR flag is generated only in asynchronous mode.
When the BRK flag in SCFSR or the ORER flag in SCLSR is set to 1, a BRI interrupt request is
generated.
When the ER flag in SCFSR is set to 1, an ERI interrupt request is generated.
When transmitting or receiving data are transferred by DMAC, DMAC should be set enable at
first, and then SCIF should be set enable. SCIF should be set not to request RXI or TXI interrupt
to INTC. If SCIF is set to request the interrupt, DMA transfer clears the request to INTC
independently of interrupt handling program.
When the RIE bit is set to 0 and the REIE bit is set to 1, SCIF request ERI interrupt and BRI
interrupt without requesting RXI interrupt.
The TXI interrupt indicates that transmit data can be written, and the RXI interrupt indicates that
there is receive data in SCFRDR.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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