HD6433636SW datasheet(269/418 Pages) RENESAS

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(1) Transmit/Receive Format: Figure 10.12 shows the general communication data format for

synchronous communication.

Note:

At high level except during continuous transmit/receive.

Serial data

Serial clock

One unit of communication data (character or frame)

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Don't

care

Don't

care

LSB

MSB

8 bits

Figure 10.12 Data Format in Synchronous Communication Mode

In synchronous communication, data is output to the communication line during the period from

one falling edge of the synchronous clock to the next falling edge. Data fixing is guaranteed at the

rising edge of the synchronous clock.

One character of data starts from the LSB and ends with the MSB. The communication line retains

the MSB state after the MSB is output.

In synchronous receive mode, SCI3 latches receive data in synchronization with the rising edge of

the serial clock.

The transmit/receive format is fixed at 8-bit data. No parity bit or multiprocessor bit is added in

this mode.

(2) Clock: Either an internal clock from the built-in baud rate generator is used, or an external

clock is input at pin SCK

3. The choice of clock sources is designated by bit COM in SMR and bits

CKE1 and CKE0 in serial control register 3 (SCR3). See table 10.12 for details on selecting the

clock source.

When operation is based on an internal clock, a serial clock is output at pin SCK

3. Eight clock

pulses are output per character of transmit/receive data. When no transmit or receive operation is

being performed, the pin is held at the high level.

(3) Data Transmit/Receive Operations

SCI3 Initialization: Before data is sent or received, bits TE and RE in serial control register 3

(SCR3) must be cleared to 0, after which initialization can be performed using the procedure.

HD6433636SW Datasheet(PDF) 269 Page - Renesas Technology Corp

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