HD6432142 datasheet(482/1177 Pages) RENESAS

482 / 1177 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 4.00 Sep 27, 2006 page 438 of 1130

REJ09B0327-0400

Bit 5—Overrun Error (ORER): Indicates that an overrun error occurred during reception,

causing abnormal termination.

Bit 5

ORER

Description

[Clearing condition]

(Initial value)*

When 0 is written in ORER after reading ORER = 1

[Setting condition]

When the next serial reception is completed while RDRF = 1*

Notes: 1. The ORER flag is not affected and retains its previous state when the RE bit in SCR is

cleared to 0.

2. The receive data prior to the overrun error is retained in RDR, and the data received

subsequently is lost. Also, subsequent serial reception cannot be continued while the

ORER flag is set to 1. In synchronous mode, serial transmission cannot be continued,

either.

Bit 4—Framing Error (FER): Indicates that a framing error occurred during reception in

asynchronous mode, causing abnormal termination.

Bit 4

FER

Description

[Clearing condition]

(Initial value)*

When 0 is written in FER after reading FER = 1

[Setting condition]

When the SCI checks the stop bit at the end of the receive data when reception ends,

and the stop bit is 0*

Notes: 1. The FER flag is not affected and retains its previous state when the RE bit in SCR is

cleared to 0.

2. In 2-stop-bit mode, only the first stop bit is checked for a value of 0; the second stop bit

is not checked. If a framing error occurs, the receive data is transferred to RDR but the

RDRF flag is not set. Also, subsequent serial reception cannot be continued while the

FER flag is set to 1. In synchronous mode, serial transmission cannot be continued,

either.

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