H8SX1663 datasheet(725/1158 Pages) RENESAS

725 / 1158 page

Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 673 of 1102

REJ09B0294-0100

Bit

Bit Name

Initial

Value

R/W

Description

RDRF

R/(W)* Receive Data Register Full

Indicates whether receive data is stored in RDR.

[Setting condition]

• When serial reception ends normally and receive data

is transferred from RSR to RDR

[Clearing conditions]

• When 0 is written to RDRF after reading RDRF = 1

(When the CPU is used to clear this flag by writing 0

while the corresponding interrupt is enabled, be sure

to read the flag after writing 0 to it.)

• When an RXI interrupt request is issued allowing

DMAC or DTC to read data from RDR

The RDRF flag is not affected and retains its previous

value when the RE bit in SCR is cleared to 0.

Note that when the next serial reception is completed

while the RDRF flag is being set to 1, an overrun error

occurs and the received data is lost.

ORER

R/(W)* Overrun Error

Indicates that an overrun error has occurred during

reception and the reception ends abnormally.

[Setting condition]

• When the next serial reception is completed while

RDRF = 1

In RDR, receive data prior to an overrun error

occurrence is retained, but data received after the

overrun error occurrence is lost. When the ORER flag

is set to 1, subsequent serial reception cannot be

performed. Note that, in clocked synchronous mode,

serial transmission also cannot continue.

[Clearing condition]

• When 0 is written to ORER after reading ORER = 1

(When the CPU is used to clear this flag by writing 0

while the corresponding interrupt is enabled, be sure

to read the flag after writing 0 to it.)

Even when the RE bit in SCR is cleared, the ORER

flag is not affected and retains its previous value.

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