HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 421
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HD6417618
Manufacturer Part Number
HD6417618
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417618.pdf
(646 pages)
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4. Sending a Break Signal
5. Receive Data Sampling Timing and Receive Margin (Asynchronous Mode)
The I/O condition and level of the TxD pin are determined by the SPBIO and SPBDT bits in
the serial port register (SCSPTR). This feature can be used to send a break signal.
Until TE bit is set to 1 (enabling transmission) after initializing, TxD pin does not work.
During the period, mark status is performed by SPBDT bit. Therefore, the SPBIO and SPBDT
bits should be set to 1 (high level output).
To send a break signal during serial transmission, clear the SPBDT bit to 0 (designating low
level), 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
TxD pin.
The SCIF operates on a base clock with a frequency of 16 times the transfer 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 14.24.
The receive margin in asynchronous mode can therefore be expressed as shown in equation 1.
Synchronization
sampling timing
Data sampling
Receive data
Base clock
Figure 14.24 Receive Data Sampling Timing in Asynchronous Mode
timing
(RxD)
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
Start bit
8 clocks
16 clocks
–7.5 clocks
Section 14 Serial Communication Interface with FIFO (SCIF)
+7.5 clocks
Rev. 6.00 Jun. 12, 2007 Page 389 of 610
D0
REJ09B0131-0600
D1
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