Operation In Synchronous Mode - Renesas H8/38024 Hardware Manual

Figure 10.9 shows an example of the operation when receiving in asynchronous mode.
Start
bit
Serial
1 0 D0
data
RDRF
FER
LSI
operation
User
processing
Figure 10.9 Example of Operation when Receiving in Asynchronous Mode
10.3.3

Operation in Synchronous Mode

In synchronous mode, SCI3 transmits and receives data in synchronization with clock pulses. This
mode is suitable for high-speed serial communication.
SCI3 has separate transmission and reception units, allowing full-duplex communication with a
shared clock.
As the transmission and reception units are both double-buffered, data can be written during
transmission and read during reception, making possible continuous transmission and reception.
Receive Parity Stop
data bit bit
D1 D7 0/1 1
1 frame
RXI request
(8-Bit Data, Parity, 1 Stop Bit)
Start Receive
bit data
0 D0 D1 D7
1 frame
RDRF
cleared to 0
RDR data read
Rev. 6.00, 08/04, page 357 of 628
Parity Stop Mark state
bit bit (idle state)
0/1 0 1
0 start bit ERI request in
detected response to
framing error
Framing error
processing