Section 14 Synchronous Serial Communication Unit (SSU)
Rev. 3.00 Mar. 14, 2006 Page 519 of 804
REJ09B0104-0300
14.3.5
SS Status Register (SSSR)
SSSR is a status flag register for interrupts.
7
—
0
R/W
6
ORER
0
R/W
5
—
0
R/W
4
—
0
R/W
3
TEND
0
R/W
0
CE
0
R/W
2
TDRE
1
R/W
1
RDRF
0
R/W
Bit
Bit Name
Initial Value
R/W
Bit Bit
Name
Initial
Value R/W Description
7
0
Reserved
This bit is always read as 0. The write value should
always be 0.
6 ORER
0 R/W
Overrun
Error
If the next data is received while RDRF
=
1, an overrun
error occurs, indicating abnormal termination. SSRDR
stores 1-frame receive data before an overrun error
occurs and loses data to be received later. While ORER
=
1, consecutive serial reception cannot be continued.
Serial transmission cannot be continued, either.
[Setting condition]
When one byte of the next reception is completed with
RDRF
=
1
[Clearing condition]
When writing 0 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.)
5, 4
All
0
R/W
Reserved
These bits are always read as 0. The write value should
always be 0.
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