Serial Status Register (Ssr) - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group
15.2.7

Serial Status Register (SSR)

Note: • Some bits in SSR have different functions in serial communications interface mode and smart card interface
mode.
(1) Serial Communications Interface Mode (SMIF in SCMR = 0)
b7 b6
— —
Value after reset: x x
x: Undefined
Bit Symbol Bit Name
b0 MPBT Multi-Processor Bit Transfer
b1 MPB Multi-Processor
b2 TEND Transmit End Flag
b3 PER Parity Error Flag
b4 FER Framing Error Flag
b5 ORER Overrun Error Flag
b7, b6 — Reserved
Note 1. Only 0 can be written to this bit, to clear the flag.
MPB Bit (Multi-Processor)
Holds the value of the multi-processor bit in the reception frame. This bit does not change when the RE bit in SCR is 0.
TEND Flag (Transmission End Flag)
Indicates completion of transmission.
[Setting conditions]
• Clearing of the SCR.TE bit to 0 (disabling serial transmission operations)
When the SCR.TE bit is changed from 0 to 1, the TEND flag is not affected and retains the value 1.
• The TDR is not updated at the time of transmission of the tail-end bit of a character being transmitted
[Clearing condition]
• When data for transmission are written to the TDR while the SCR.TE is 1
When the TEND flag is cleared in response to writing of data for transmission to the TDR, dummy read the TEND
flag before return from interrupt exception processing for TEI interrupt requests when the latter are enabled.
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
b5 b4 b3 b2
ORER FER PER TEND
0 0 0 1
b1 b0
MPB MPBT
0 0
Description
Sets the multi-processor bit for adding to the transmission frame
0: Data transmission cycles
1: ID transmission cycles
Value of the multi-processor bit in the reception frame
0: Data transmission cycles
1: ID transmission cycles
0: A character is being transmitted.
1: Character transfer has been completed.
0: No parity error occurred
1: A parity error has occurred
0: No framing error occurred
1: A framing error has occurred
0: No overrun error occurred
1: An overrun error has occurred
The read value is undefined. The write value should be 1.
15. Serial Communications Interface
R/W
R/W
R
R
R/(W)
1
*
R/(W)
1
*
R/(W)
1
*
R
15-12