Renesas H8SX/1650 Hardware Manual page 486

Section 13 Serial Communication Interface (SCI)
Bit Bit Name
6 RDRF
5 ORER
Rev.2.00 Jun. 28, 2007 Page 464 of 666
REJ09B0311-0200
Initial
Value R/W Description
0 R/(W)* Receive Data Register Full
Indicates whether receive data is stored in RDR.
[Setting condition]
•
[Clearing conditions]
•
•
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.
0 R/(W)* Overrun Error
Indicates that an overrun error has occurred during
reception and the reception ends abnormally.
[Setting condition]
•
[Clearing condition]
•
When serial reception ends normally and receive
data is transferred from RSR to RDR
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
DTC to read data from RDR
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.
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.