Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Sep. 27, 2007 Page 454 of 758
REJ09B0243-0300
Figure 12.7 shows an example of the operation for reception.
1
0
D0
D1
D7
0/1
1
0
D0
D1
D7
0/1
0/1
1
RDRF
FER
Serial
data
Start
bit
Data
Parity
bit
Stop
bit
Start
bit
Data
Parity
bit
Stop
bit
RXI interrupt
request
One frame
Data read and RDRF flag
cleared to 0 by RXI
interrupt handler
ERI interrupt request
generated by framing
error
Figure 12.7 Example of SCI Receive Operation
(8-Bit Data, Parity, One Stop Bit)
12.4.3
Clock Synchronous Mode (Channel 1 in the SH7124 is not Available)
In clock synchronous mode, the SCIF transmits and receives data in synchronization with clock
pulses. This mode is suitable for high-speed serial communication.
The SCI transmitter and receiver are independent, so full-duplex communication is possible while
sharing the same clock. Both the transmitter and receiver have a double-buffered structure so that
data can be read or written during transmission or reception, enabling continuous data transfer.
Figure 12.8 shows the general format in clock synchronous serial communication.
Don't care
Don't care
One unit of transfer data (character or frame)
Bit 0
Serial data
Synchronization
clock
Bit 1
Bit 3
Bit 4
Bit 5
LSB
MSB
Bit 2
Bit 6
Bit 7
*
*
Note:
*
High level except in continuous transfer
Figure 12.8 Data Format in Clock Synchronous Communication
Summary of Contents for SH7124 R5F7124
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