HD6433044 Datasheet, PDF (462/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

13.2.7 Serial Status Register (SSR)
SSR is an 8-bit register containing multiprocessor bit values, and status flags that indicate SCI
operating status.
Bit
Initial value
Read/Write
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)*
2
TEND
1
R
1
MPB
0
R
0
MPBT
0
R/W
Multiprocessor
bit transfer
Value of multi-
processor bit to
be transmitted
Multiprocessor bit
Stores the received
multiprocessor bit value
Transmit end
Status flag indicating end of
transmission
Parity error
Status flag indicating detection of
a receive parity error
Framing error
Status flag indicating detection of a receive
framing error
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
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
Note: * Only 0 can be written, to clear the flag.
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