HD6433644R datasheet(302/549 Pages) RENESAS

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Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 282 of 526

REJ09B0326-0600

Bit 6



Extended Data Bit (SOL): Bit 6 sets the SO1 output level. When read, SOL returns the

output level at the SO1 pin. After completion of a transmission, SO1 continues to output the value

of the last bit of transmitted data. The SO1 output can be changed by writing to SOL before or

after a transmission. The SOL bit setting remains valid only until the start of the next transmission.

SSB mode settings also become invalid. To control the level of the SO1 pin after transmission

ends, it is necessary to write to the SOL bit at the end of each transmission. Do not write to this

Bit 6: SOL

Description

Read: SO1 pin output level is low

(initial value)

Write: SO1 pin output level changes to low

Read: SO1 pin output level is high

Write: SO1 pin output level changes to high

Bit 5



Overrun Error Flag (ORER): When an external clock is used, bit 5 indicates the

occurrence of an overrun error. If noise occurs during a transfer, causing an extraneous pulse to be

superimposed on the normal serial clock, incorrect data may be transferred. If a clock pulse is

input after transfer completion, this bit is set to 1 indicating an overrun.

Bit 5: ORER

Description

Clearing condition:

After reading ORER = 1, cleared by writing 0 to ORER

(initial value)

Setting condition:

Set if a clock pulse is input after transfer is complete, when an external clock is

used

Bits 4 to 2



Reserved Bits: Bits 4 to 2 are reserved. They are always read as 0, and cannot be

modified.

Bit 1



TAIL MARK Transmit Flag (MTRF): When bit MRKON is set to 1, bit 1 indicates that

TAIL MARK is being sent. Bit 1 is a read-only bit and cannot be modified.

Bit 1: MTRF

Description

Idle state, or 8- or 16-bit data is being transferred

(initial value)

TAIL MARK is being sent

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