HD6432138SW datasheet(456/1061 Pages) RENESAS

456 / 1061 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 4.00 Jun 06, 2006 page 402 of 1004

REJ09B0301-0400

Bit 6—Receive Data Register Full (RDRF): Indicates that the received data is stored in RDR.

Bit 6

RDRF

Description

[Clearing conditions]

(Initial value)

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

• When the DTC is activated by an RXI interrupt and reads data from RDR

[Setting condition]

When serial reception ends normally and receive data is transferred from RSR to RDR

Note:

RDR and the RDRF flag are not affected and retain their previous values when an error is

detected during reception or when the RE bit in SCR is cleared to 0.

If reception of the next data is completed while the RDRF flag is still set to 1, an overrun

error will occur and the receive data will be lost.

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.

HD6432138SW Datasheet(PDF) 456 Page - Renesas Technology Corp