HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 677

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

14.3.4
In 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 14.14 shows the general format for synchronous serial communication.
In synchronous serial communication, data on the communication 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 synchronous serial communication, one character consists of data output starting with the LSB
and ending with the MSB. After the MSB is output, the communication line holds the MSB state.
In 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.
Note: * High except in continuous transfer
Operation in Synchronous Mode
Serial
Serial
clock
data
Don't care
Figure 14.14 Data Format in Synchronous Communication
*
LSB
Bit 0
Bit 1
One unit of transfer data (character or frame)
Bit 2
Bit 3
Section 14 Serial Communication Interface (SCI)
Rev.6.00 Sep. 27, 2007 Page 647 of 1268
Bit 4
Bit 5
Bit 6
MSB
Bit 7
REJ09B0220-0600
Don't care
*