337
11.2.7 Serial Status Register (SSR)
SSR is an 8-bit register containing multiprocessor bit values, and status flags that indicate the SCI
operating status.
Bit
Initial value
Read/Write
Note:
*
Only 0 can be written to clear the flag.
7
TDRE
1
R/(W)
6
RDRF
0
R/(W)
5
ORER
0
R/(W)
4
FER
0
R/(W)
3
PER
0
R/(W)
0
MPBT
0
R/W
2
TEND
1
R
1
MPB
0
R
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
Multiprocessor
bit transfer
Value of multi-
processor bit to
be transmitted
Receive data register full
Status flag indicating that data has been received and stored in RDR
Overrun error
Status flag indicating detection of a receive overrun error
Framing error
Status flag indicating detection of a receive
framing error
Parity error
Status flag indicating detection of
a receive parity error
Transmit end
Status flag indicating end of
transmission
*
*
*
*
*
Multiprocessor bit
Stores the received
multiprocessor bit value