21. Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Jan. 10, 2008 Page 1083 of 1658
REJ09B0261-0100
In serial reception, the SCIF operates as follows.
1. The SCIF monitors the transmission line, and if a 0-start bit is detected, performs internal
synchronization and starts reception.
2. The received data is stored in SCRSR in LSB-to-MSB order.
3. The parity bit and stop bit are received.
After receiving these bits, the SCIF carries out the following checks.
(a) Stop bit check: The SCIF checks whether the stop bit is 1. If there are two stop bits, only
the first is checked.
(b) The SCIF checks whether receive data can be transferred from SCRSR to SCFRDR.
*
(c) Overrun error check: The SCIF checks that the ORER flag is 0, indicating that no overrun
error has occurred.
*
(d) Break check: The SCIF checks that the BRK flag is 0, indicating that the break state is not
set.
*
If (b), (c), and (d) checks are passed, the receive data is stored in SCFRDR.
Note:
*
Reception continues even when a parity error or framing error occurs.
4. If the RIE bit in SCSCR is set to 1 when the RDF or DR flag changes to 1, a receive-FIFO-
data-full interrupt (RXI) request is generated.
If the RIE bit or REIE bit in SCSCR is set to 1 when the ER flag changes to 1, a receive-error
interrupt (ERI) request is generated.
If the RIE bit or REIE bit in SCSCR is set to 1 when the BRK or ORER flag changes to 1, a
break reception interrupt (BRI) request is generated.
Figure 21.13 shows an example of the operation for reception in asynchronous mode.
1
0
D0
D1
D7
0/1
1
0
D0
D1
D7
0/1
0/1
0
RDF
FER
Framin
g
error
detected
Serial
data
SCIF_RXD
Start
bit
Data
Parity
bit
Stop
bit
Start
bit
Data
Parity
bit
Stop
bit
RXI interrupt
request
One frame
Data read and RDF fla
g
read as 1 then cleared to
0 by RXI interrupt handler
ERI interrupt request
g
enerated by receive
error
Figure 21.13 Example of SCIF Receive Operation
(Example with 8-Bit Data, Parity, One Stop Bit)
Содержание SH7781
Страница 4: ...Rev 1 00 Jan 10 2008 Page iv of xxx REJ09B0261 0100 ...
Страница 74: ...2 Programming Model Rev 1 00 Jan 10 2008 Page 44 of 1658 REJ09B0261 0100 ...
Страница 272: ...8 Caches Rev 1 00 Jan 10 2008 Page 242 of 1658 REJ09B0261 0100 ...
Страница 376: ...10 Interrupt Controller INTC Rev 1 00 Jan 10 2008 Page 346 of 1658 REJ09B0261 0100 ...
Страница 694: ...13 PCI Controller PCIC Rev 1 00 Jan 10 2008 Page 664 of 1658 REJ09B0261 0100 ...
Страница 762: ...14 Direct Memory Access Controller DMAC Rev 1 00 Jan 10 2008 Page 732 of 1658 REJ09B0261 0100 ...
Страница 788: ...15 Clock Pulse Generator CPG Rev 1 00 Jan 10 2008 Page 758 of 1658 REJ09B0261 0100 ...
Страница 828: ...17 Power Down Mode Rev 1 00 Jan 10 2008 Page 798 of 1658 REJ09B0261 0100 ...
Страница 846: ...18 Timer Unit TMU Rev 1 00 Jan 10 2008 Page 816 of 1658 REJ09B0261 0100 ...
Страница 1292: ...24 Multimedia Card Interface MMCIF Rev 1 00 Jan 10 2008 Page 1262 of 1658 REJ09B0261 0100 ...
Страница 1326: ...25 Audio Codec Interface HAC Rev 1 00 Jan 10 2008 Page 1296 of 1658 REJ09B0261 0100 ...
Страница 1482: ...28 General Purpose I O Ports GPIO Rev 1 00 Jan 10 2008 Page 1452 of 1658 REJ09B0261 0100 ...
Страница 1538: ...30 User Debugging Interface H UDI Rev 1 00 Jan 10 2008 Page 1508 of 1658 REJ09B0261 0100 ...
Страница 1688: ...Appendix Rev 1 00 Jan 10 2008 Page 1658 of 1658 REJ09B0261 0100 ...
Страница 1691: ......
Страница 1692: ...SH7785 Hardware Manual ...