HD6433644R datasheet(342/549 Pages) RENESAS

342 / 549 page

Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 322 of 526

REJ09B0326-0600

10.3.5

Operation in Synchronous Mode

In synchronous mode, SCI3 transmits and receives data in synchronization with clock pulses. This

mode is suitable for high-speed serial communication.

SCI3 has separate transmission and reception units, allowing full-duplex communication with a

shared clock.

As the transmission and reception units are both double-buffered, data can be written during

transmission and read during reception, making possible continuous transmission and reception.

Data Transfer Format: The general data transfer format in synchronous communication is shown

in figure 10.15.

Serial

clock

Serial

data

Note: * High level except in continuous transmission/reception

LSB

MSB

Bit 1

Bit 0

Bit 2

Bit 3

Bit 4

8 bits

One transfer data unit (character or frame)

Bit 5

Bit 6

Bit 7

Don't

care

Don't

care

Figure 10.15 Data Format in Synchronous Communication

In synchronous communication, data on the communication line is output from one falling edge of

the serial clock until the next falling edge. Data confirmation is guaranteed at the rising edge of the

serial clock.

One transfer data character begins with the LSB and ends with the MSB. After output of the MSB,

the communication line retains the MSB state.

When receiving in synchronous mode, SCI3 latches receive data at the rising edge of the serial

clock.

The data transfer format uses a fixed 8-bit data length.

Parity and multiprocessor bits cannot be added.

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