HD6433636SW datasheet(268/418 Pages) RENESAS

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Figure 10.11 shows a typical SCI3 data receive operation in asynchronous mode.

0/1

Start

bit

Parity

bit

Stop

bit

Parity

bit

Stop

bit

Start

bit

Mark

(idle state)

RDRF

FER

1 frame

Serial

data

RXI request

Detects stop bit = 0

ERI request due

to framing error

1 frame

SCI3 operation

Receive

data

Receive

data

Read RDR data

User processing

RDRF cleared

to 0

Framing error

handling

Figure 10.11 Typical Receive Operation in Asynchronous Mode

(8-Bit Data, Parity Bit Added, and 1 Stop Bit)

10.3.5

Operation in Synchronous Mode

In synchronous mode, data is sent or received in synchronization with clock pulses. This mode is

suited to high-speed serial communication.

SCI3 consists of independent transmit and receive modules, so full duplex communication is

possible, sharing the same clock between both modules. Both the transmit and receive modules

have a double-buffer configuration. This allows data to be written during a transmit operation so

that data can be transmitted continuously, and enables data to be read during a receive operation so

that data can be received continuously.

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