SH7050 Datasheet, PDF (434/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

Section 13 Serial Communication Interface (SCI)
Example: Own ID matches data, 8-bit data with multiprocessor bit and one stop bit
Serial
data
Start Data
1 _{bit (ID2)}
0 D0 D1
Stop Start Data
MPB bit bit (data 2)
D7 1 1 0 D0 D1
Stop
MPB bit
1
D7 0 1 Idling
(marking)
MPB
MPIE
RDRF
RDR
value
ID1
ID2
Data2
RxI interrupt request
(multiprocessor
interrupt), MPIE = 0
RxI interrupt handler
reads data in RDR
and clears RDRF to 0
Station’s ID, so receiving MPIE
continues, with data bit is again
received by the RxI
set to 1
interrupt processing routine
Figure 13.15 Example of SCI Receive Operation (ID Matches)
13.3.4 Clock Synchronous Operation
In the clock synchronous mode, the SCI 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. The transmitter and receiver are also double buffered, so continuous
transmitting or receiving is possible by reading or writing data while transmitting or receiving is in
progress.
Figure 13.16 shows the general format in clock synchronous serial communication.
Rev. 5.00 Jan 06, 2006 page 414 of 818
REJ09B0273-0500