HD6433644R datasheet(330/549 Pages) RENESAS

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Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 310 of 526

REJ09B0326-0600

• Choice of internal or external clock as the clock source

When internal clock is selected: SCI3 operates on the baud rate generator clock, and a clock

with the same frequency as the bit rate can be output.

When external clock is selected: A clock with a frequency 16 times the bit rate must be input.

(The on-chip baud rate generator is not used.)

Synchronous Mode

• Data transfer format: Fixed 8-bit data length

• Overrun error (OER) detection during reception

• Choice of internal or external clock as the clock source

When internal clock is selected: SCI3 operates on the baud rate generator clock, and a serial

clock is output.

When external clock is selected: The on-chip baud rate generator is not used, and SCI3

operates on the input serial clock.

Table 10.11 SMR Settings and Corresponding Data Transfer Formats

SMR Setting

Communication Format

Bit 7:

COM

Bit 6:

CHR

Bit 2:

Bit 5:

Bit 3:

STOP Mode

Data Length

Multipro-

cessor Bit

Parity

Bit

Stop Bit

Length

Asynchronous

8-bit data

1 bit

mode

2 bits

Yes

1 bit

2 bits

7-bit data

1 bit

2 bits

Yes

1 bit

2 bits

8-bit data

Yes

1 bit

2 bits

7-bit data

1 bit

Asynchronous

mode

(multiprocessor

format)

2 bits

Synchronous

mode

8-bit data

Legend: * Don’t care

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