SH7261 datasheet(749/1348 Pages) RENESAS

749 / 1348 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev. 2.00 Sep. 07, 2007 Page 717 of 1312

REJ09B0320-0200

16.4.3

Operation in Clocked Synchronous Mode

In clocked synchronous mode, the SCIF transmits and receives data in synchronization with clock

pulses. This mode is suitable for high-speed serial communication.

The SCIF transmitter and receiver are independent, so full-duplex communication is possible

while sharing the same clock. The transmitter and receiver are also 16-byte FIFO buffered, so

continuous transmitting or receiving is possible by reading or writing data while transmitting or

receiving is in progress.

Figure 16.9 shows the general format in clocked synchronous serial communication.

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

LSB

MSB

Don't care

One unit of transfer data (character or frame)

Serial data

Serial clock

Note: * High except in continuous transfer

Figure 16.9 Data Format in Clocked Synchronous Communication

In clocked synchronous serial communication, each data bit is output on the communication line

from one falling edge of the serial clock to the next. Data is guaranteed valid at the rising edge of

the serial clock.

In each character, the serial data bits are transmitted in order from the LSB (first) to the MSB

(last). After output of the MSB, the communication line remains in the state of the MSB.

In clocked synchronous mode, the SCIF receives data by synchronizing with the rising edge of the

serial clock.

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