h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 512

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Serial Communication Interface (SCI)
13.3.4
In clocked synchronous mode, data is transmitted or received in synchronization with clock
pulses, making it suitable for high-speed serial communication.
Inside the SCI, the transmitter and receiver are independent units, enabling full-duplex
communication by use of a common clock. Both the transmitter and the receiver also have a
double-buffered structure, so that data can be read or written during transmission or reception,
enabling continuous data transfer.
Figure 13.14 shows the general format for clocked synchronous serial communication.
In clocked synchronous serial communication, data on the transmission line is output from one
falling edge of the serial clock to the next. Data confirmation is guaranteed at the rising edge of
the serial clock.
In clocked serial communication, one character consists of data output starting with the LSB and
ending with the MSB. After the MSB is output, the transmission line holds the MSB state.
In clocked synchronous mode, the SCI receives data in synchronization with the rising edge of the
serial clock.
Data Transfer Format
A fixed 8-bit data format is used.
No parity or multiprocessor bits are added.
Rev. 5.00 Sep 22, 2005 page 486 of 1136
REJ09B0257-0500
Note: * High except in continuous transfer
Serial
Serial
clock
data
Operation in Clocked Synchronous Mode
Don’t care
*
Figure 13.14 Data Format in Synchronous Communication
LSB
Bit 0
Bit 1
One unit of transfer data (character or frame)
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
MSB
Bit 7
Don’t care
*