HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 770
HD6417641
Manufacturer Part Number
HD6417641
Description
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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Section 19 Serial Communication Interface with FIFO (SCIF)
19.3.12 Line Status Register (SCLSR)
The CPU can always read or write to SCLSR, but cannot write 1 to the ORER flag. This flag can
be cleared to 0 only if it has first been read (after being set to 1). SCLSR is initialized to H'0000
by a power-on reset.
Note:
Rev. 4.00 Sep. 14, 2005 Page 720 of 982
REJ09B0023-0400
Bit
15 to 1
0
*
Bit Name
—
ORER
The only value that can be written is 0 to clear the flag.
Initial
value
All 0
0
R/W
R
R/(W)* Overrun Error
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Indicates the occurrence of an overrun error.
0: Receiving is in progress or has ended normally*
[Clearing conditions]
•
•
1: An overrun error has occurred*
[Setting condition]
•
Notes: 1. Clearing the RE bit to 0 in SCSCR does
ORER is cleared to 0 when the chip is a power-on
reset
ORER is cleared to 0 when 0 is written after 1 is
read from ORER.
ORER is set to 1 when the next serial receiving is
finished while the receive FIFO is full of 16-byte
receive data.
2. The receive FIFO data register (SCFRDR)
not affect the ORER bit, which retains its
previous value.
hold the data before an overrun error is
occurred, and the next receive data is
extinguished. When ORER is set to 1,
SCIF cannot continue the next serial
receiving.
2
1
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