h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 387

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

14.6
Figure 14.14 shows the general format for clocked synchronous communication. In clocked
synchronous mode, data is transmitted or received synchronous with clock pulses. Each character
of data transferred consists of 8 bits. 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 or
written during transmission or reception, enabling continuous data transfer.
14.6.1
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.
Synchronization
clock
Serial data
Note: * High except in continuous transfer
Figure 14.14 Data Format in Synchronous Communication (For LSB-First)
Operation in Clocked Synchronous Mode
Clock
Don’t care
*
LSB
Bit 0
One unit of transfer data (character or frame)
Bit 1
Bit 2
Section 14 Serial Communication Interface (SCI)
Bit 3
Rev. 3.00 Oct 04, 2005 page 347 of 598
Bit 4
Bit 5
Bit 6
REJ09B0155-0300
MSB
Bit 7
Don’t care
*