Datasheet

Section 13 Serial Communication Interface
Page 440 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
13.6 Operation in Clocked Synchronous Mode
Figure 13.18 shows the general format for clocked synchronous communication. In clocked
synchronous mode, data is transmitted or received synchronous with clock pulses. In clocked
synchronous serial communication, data on the transmission line is output from one falling edge of
the serial clock to the next. In clocked synchronous mode, the SCI receives data in synchronous
with the rising edge of the serial clock. After 8-bit data is output, the transmission line holds the
MSB state. In clocked synchronous mode, no parity or multiprocessor bit is added. Inside the SCI,
the transmitter and receiver are independent units, enabling full-duplex communication through
the use of a common clock. Both the transmitter and the receiver also have a double-buffered
structure, so data can be read from or written during transmission or reception, enabling
continuous data transfer.
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 except in continuous transfer
Figure 13.18 Data Format in Synchronous Communication (For LSB-First)
13.6.1 Clock
Either an internal clock generated by the on-chip baud rate generator or an external
synchronization clock input at the SCK pin can be selected, according to the setting of CKE0 and
CKE1 bits in SCR. When the SCI is operated on an internal clock, the serial clock is output from
the SCK pin. Eight serial clock pulses are output in the transfer of one character, and when no
transfer is performed the clock is fixed high.