HD6413008VF25 Datasheet, PDF (383/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

12. Serial Communication Interface
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.
Bit
Initial value
Read/Write
7
6
5
4
3
2
TDRE RDRF ORER FER/ERS PER TEND
1
0
0
0
0
1
R/(W)∗¹ R/(W)∗¹ R/(W)∗¹ R/(W)∗¹ R/(W)∗¹ R
1
MPB
0
R
0
MPBT
0
R/W
Multiprocessor bit transfer
Value of multiprocessor bit
to be transmitted
Multiprocessor bit
Stores the received
multiprocessor bit value
Transmit end∗²
Status flag indicating end of transmission
Parity error
Status flag indicating detection of a receive parity
error
Framing error (FER)/Error signal status (ERS)∗²
Status flag indicating detection of a receive framing error,
or flag indicating detection of an error signal
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
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.
Rev.4.00 Aug. 20, 2007 Page 337 of 638
REJ09B0395-0400