HD643303x Hitachi, HD643303x Datasheet - Page 340

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

11.2.7 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
Note:
*
Only 0 can be written, to clear the flag.
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
R/(W)
TDRE
7
1
*
Receive data register full
Status flag indicating that data has been received and stored in RDR
R/(W)
RDRF
6
0
*
Overrun error
Status flag indicating detection of a receive overrun error
ORER
R/(W)
5
0
*
Framing error
Status flag indicating detection of a receive
framing error
R/(W)
325
FER
4
0
*
Parity error
Status flag indicating detection of
a receive parity error
R/(W)
PER
3
0
*
Transmit end
Status flag indicating end of
transmission
TEND
R
2
1
Multiprocessor bit
Stores the received
multiprocessor bit value
MPB
R
1
0
Multiprocessor
bit transfer
Value of multi-
processor bit to
be transmitted
MPBT
R/W
0
0