3069RF-ZTAT Datasheet, PDF (927/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

SSR—Serial Status Register
H'FFFB4
SCI0
Bit
Initial value
Read/Write
7
TDRE
1
R/(W)*
6
RDRF
0
R/(W)*
5
4
3
ORER
0
R/(W)*
FER/ERS
0
R/(W)*
PER
0
R/(W)*
2
TEND
1
R
1
MPB
0
R
0
MPBT
0
R/W
Multiprocessor bit transfer
0 Multiprocessor bit value in transmit data is 0
1 Multiprocessor bit value in transmit data is 1
Multiprocessor bit
0 Multiprocessor bit value in receive data is 0
1 Multiprocessor bit value in receive data is 1
Transmit end (for serial communication interface)
[Clearing conditions]
0 ^{Read TDRE when TDRE = 1, then write 0 in TDRE.}
The DMAC writes data in TDR.
[Setting conditions]
Reset or transition to standby mode
1 ^{TE is cleared to 0 in SCR.}
TDRE is 1 when last bit of 1-byte serial character is
transmitted.
Transmit end (for smart card interface)
[Clearing conditions]
0 ^{Read TDRE when TDRE = 1, then write 0 in TDRE.}
The DMAC writes data in TDR.
[Setting conditions]
Reset or transition to standby mode
1 ^{TE is cleared to 0 in SCR and FER/ERS is cleared to 0.}
TDRE is 1 and FER/ERS is 0 (normal transmission) 2.5 etu*¹
(when GM = 0) or 1.0 etu (when GM = 1) after 1-byte serial
character is transmitted.
Note: *1 etu: Elementary time unit (time required to transmit one bit)
Parity error
0
[Clearing conditions] Reset or transition to standby mode.
Read PER when PER = 1, then write 0 in PER
1 ^{[Setting condition]}
Parity error (parity of receive data does not match parity
setting of O/- bit in SMR)
Framing error (for serial communication interface)
0
[Clearing conditions] Reset or transition to standby mode.
Read FER when FER = 1, then write 0 in FER
1 [Setting condition] Framing error (stop bit is 0)
Error signal status (for smart card interface)
0
[Clearing conditions] Reset or transition to standby mode.
Read ERS when ERS = 1, then write 0 in ERS
1 [Setting condition] A low error signal is received
Overrun error
0
[Clearing conditions]
Reset or transition to standby mode.
Read ORER when ORER = 1, then write 0 in ORER
1 [Setting condition] Overrun error (reception of the next serial data ends when RDRF = 1)
Receive data register full
0
[Clearing conditions]
Reset or transition to standby mode.
Read RDRF when RDRF = 1, then write 0 in RDRF
The DMAC reads data from RDR
1 [Setting condition] Serial data is received normally and transferred from RSR to RDR
Transmit data register empty
0
[Clearing conditions] Read TDRE when TDRE = 1, then write 0 in TDRE
The DMAC writes data in TDR
[Setting conditions]
1
Reset or transition to standby mode.
TE is 0 in SCR
Data is transferred from TDR to TSR, enabling new data to be written in TDR.
Note: * Only 0 can be written, to clear the flag.
Rev. 5.0, 09/04, page 905 of 978