SH7055S Datasheet, PDF (540/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Serial
data
Start Data
1 _{bit (ID2)}
0 D0 D1
MPB
Stop Start Data
MPB bit bit (data 2)
D7 1 1 0 D0 D1
Stop
MPB bit
1
D7 0 1 Idling
(marking)
MPIE
RDRF
RDR
value
ID1
ID2
Data 2
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 15.16 Example of SCI Receive Operation (ID Matches)
(Example: 8-Bit Data with Multiprocessor Bit and One Stop Bit)
15.3.4 Synchronous Operation
In 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 15.17 shows the general format in synchronous serial communication.
Rev.2.0, 07/03, page 502 of 960