Section 21 Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Dec. 13, 2005 Page 783 of 1286
REJ09B0158-0100
21.4.3 Operation
in
Clocked Synchronous Mode
Clocked synchronous mode, in which data is transmitted or received in synchronization with clock
pulses, is suitable for fast serial communication.
Since the transmitter and receiver are independent units in the SCIF, full-duplex communication
can be achieved by sharing the clock. Both the transmitter and receiver have a 64-stage FIFO
buffer structure, so that data can be read or written during transmission or reception, enabling
continuous data transfer and reception.
Figure 21.15 shows the general format for clocked synchronous communication.
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 21.15 Data Format in Clocked Synchronous Communication
In clocked synchronous serial communication, data on the communication line is output from one
fall of the synchronization clock to the next fall. Data is guaranteed to be accurate at the start of
the synchronization clock.
In serial communication, each character is output starting with the LSB and ending with the MSB.
After the MSB is output, the communication line remains in the state of the last data.
In clocked synchronous mode, the SCIF receives data in synchronization with the rise of the
synchronization clock.
(1) Data Transfer Format
A fixed 8-bit data format is used. No parity bit can be added.
Содержание SH7780 Series
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