H8S2245 datasheet(460/818 Pages) RENESAS

460 / 818 page

Section 12 Serial Communication Interface (SCI)

Rev.3.00 Mar. 26, 2007 Page 418 of 772

REJ09B0355-0300

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 to RDRF after reading RDRF = 1

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

[Setting condition]

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

Notes: 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.

DTC can clear this bit only when DISEL is 0 with the transfer counter not being 0.

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 to 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 clocked synchronous mode, serial transmission cannot be

continued, either.

H8S2245 Datasheet(PDF) 460 Page - Renesas Technology Corp