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12.2.7
Serial Status Register (SSR)
SSR is an 8-bit register containing multiprocessor bit values, and status flags that indicate the
operating status of the SCI.
7
Bit
TDRE
1
Initial value
R/(W)*
Read/Write
Transmit data register empty
Status flag indicating that transmit data has been transferred from
TDR into TSR and new data can be written in TDR
Notes: 1. Only 0 can be written, to clear the flag.
2. Function differs between the normal serial communication interface and the smart card interface.
6
5
RDRF
ORER FER/ERS
0
0
1
1
1
R/(W)*
R/(W)*
Overrun error
Status flag indicating detection of a receive overrun error
Receive data register full
Status flag indicating that data has been received and stored in RDR
4
3
2
PER
TEND
0
0
1
1
1
R/(W)*
R/(W)*
R
Parity error
Status flag indicating detection of a receive parity
error
Framing error (FER)/Error signal status (ERS)*
Status flag indicating detection of a receive framing error,
or flag indicating detection of an error signal
1
0
MPB
MPBT
0
0
R
R/W
Multiprocessor bit transfer
Value of multiprocessor bit
to be transmitted
Multiprocessor bit
Stores the received
multiprocessor bit value
2
Transmit end*
Status flag indicating end of transmission
2
325
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