Section 28 Serial Communication Interface with FIFO/IrDA Interface (SCIF/IrDA)
Rev. 1.00 Oct. 01, 2007 Page 1177 of 1956
REJ09B0256-0100
(4)
Sending a Break Signal
The input/output condition and level of the SCIF_TXD pin are determined by bits SPB2IO and
SPB2DT in SCSPTR. This feature can be used to send a break signal.
After the serial transmitter is initialized and until the TE bit is set to 1 (enabling transmission), the
SCIF_TXD pin function is not selected and the value of the SPB2DT bit substitutes for the mark
state. The SPB2IO and SPB2DT bits should therefore be set to 1 (designating output and high
level) in the beginning.
To send a break signal during serial transmission, clear the SPB2DT bit to 0 (designating low
level), and then clear the TE bit to 0 (halting transmission). When the TE bit is cleared to 0, the
transmitter is initialized, regardless of the current transmission state, and 0 is output from the
SCIF_TXD pin.
(5)
Receive Data Sampling Timing and Receive Margin in Asynchronous Mode
In asynchronous mode, the SCIF operates on a base clock with a frequency of 16 times the bit
rate.
In reception, the SCIF synchronizes internally with the fall of the start bit, which it samples on the
base clock. Receive data is latched at the rising edge of the eighth base clock pulse.
The timing is shown in figure 28.20.
0 1 2 3 4 5 6 7 8 9 10 1112 1314 15 0 1 2 3 4 5 6 7 8 9 10 1112 1314 15 0 1 2 3 4 5
D0
D1
16 clocks
8 clocks
Base clock
Receive data
(RXD)
Start bit
–7.5 clocks
+7.5 clocks
Synchronization
sampling timing
Data sampling
timing
Figure 28.20 Receive Data Sampling Timing in Asynchronous Mode
Содержание SH7763
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Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
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Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
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Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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