SH7080 Datasheet, PDF (824/1644 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 15 Serial Communication Interface (SCI)
Figure 15.7 shows an example of the operation for reception.
Start
1 bit
Data
Parity Stop Start
bit bit bit
Data
Parity Stop
bit bit
Serial
data
0 D0 D1
D7 0/1 1 0 D0 D1
D7 0/1 1
0/1
RDRF
FER
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 15.7 Example of SCI Receive Operation
(8-Bit Data, Parity, One Stop Bit)
15.4.3 Clock Synchronous Mode
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 15.8 shows the general format in clock synchronous serial communication.
*
Synchronization
clock
Serial data
One unit of transfer data (character or frame)
*
LSB
MSB
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7
Don't care
Note: * High level except in continuous transfer
Don't care
Figure 15.8 Data Format in Clock Synchronous Communication
Rev. 3.00 May 17, 2007 Page 766 of 1582
REJ09B0181-0300