R01UH0823EJ0100 Rev.1.00
Page 981 of 1823
Jul 31, 2019
RX23W Group
33. Serial Communications Interface (SCIg, SCIh)
33.2.9
Serial Status Register (SSR)
Some bits in the SSR register have different functions in smart card interface mode and non-smart card interface mode.
(1) Non-Smart Card Interface Mode (SCMR.SMIF = 0)
Note 1. Only 0 can be written to this bit, to clear the flag. To clear this flag, confirm that the flag is 1 and then set it to 0.
Note 2. Write 1 when writing is necessary.
Holds the value of the multi-processor bit in the reception frame. This bit does not change when the SCR.RE bit is 0.
Indicates completion of transmission.
[Setting conditions]
When the SCR.TE bit is set to 0 (serial transmission is disabled)
When the SCR.TE bit is changed from 0 to 1, the TEND flag is not affected and retains the value 1.
When the TDR register is not updated at the time of transmission of the tail-end bit of a character being transmitted
[Clearing condition]
When transmit data are written to the TDR register while the SCR.TE bit is 1
When setting the TEND flag to 0 to complete the interrupt handling, refer to
section 15.4.1.2, Operation of
Status Flags for Level-Detected Interrupts
Address(es): SCI1.SSR 0008 A024h, SCI5.SSR 0008 A0A4h, SCI8.SSR 0008 A104h, SCI12.SSR 0008 B304h
b7
b6
b5
b4
b3
b2
b1
b0
TDRE RDRF ORER
FER
PER
TEND
MPB
MPBT
Value after reset:
1
0
0
0
0
1
0
0
Bit
Symbol
Bit Name
Description
R/W
b0
Multi-Processor Bit Transfer
Sets the multi-processor bit for adding to the transmission frame
0: Data transmission cycles
1: ID transmission cycles
R/W
b1
Multi-Processor
Value of the multi-processor bit in the reception frame
0: Data transmission cycles
1: ID transmission cycles
R
b2
Transmit End Flag
0: A character is being transmitted.
1: Character transfer has been completed.
R
b3
Parity Error Flag
0: No parity error occurred
1: A parity error has occurred
R/(W)
*
b4
Framing Error Flag
0: No framing error occurred
1: A framing error has occurred
R/(W)
*
b5
Overrun Error Flag
0: No overrun error occurred
1: An overrun error has occurred
R/(W)
*
b6
Receive Data Full Flag
0: No valid data is held in the RDR register
1: Received data is held in the RDR register
R/(W)
*
b7
Transmit Data Empty Flag
0: Data to be transmitted is held in the TDR register
1: No data is held in the TDR register
R/(W)
*