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Section 13 Serial Communication Interface (SCI)
• Bit Functions in Smart Card Interface Mode (when SMIF in SCMR = 1)
Bit
Bit Name
7
TDRE
6
RDRF
5
ORER
4
ERS
Rev. 1.00 Mar. 12, 2008 Page 442 of 1178
REJ09B0403-0100
Initial
Value
R/W
Description
1
1
R/(W)*
Transmit Data Register Empty
Indicates whether TDR contains transmit data.
[Setting conditions]
•
•
[Clearing conditions]
•
•
1
0
R/(W)*
Receive Data Register Full
Indicates whether the receive data is stored in RDR.
[Setting condition]
•
[Clearing conditions]
•
•
The RDRF flag is not affected and retains its previous
value when the RE bit in SCR is cleared to 0.
1
0
R/(W)*
Overrun Error
[Setting condition]
When the next serial reception is completed while RDRF =
1
[Clearing condition]
When 0 is written to ORER after reading ORER = 1
1
0
R/(W)*
Error Signal Status
[Setting condition]
When a low error signal is sampled
[Clearing condition]
When 0 is written to ERS after reading ERS = 1
When the TE bit in SCR is 0
When data is transferred from TDR to TSR, and TDR
can be written to.
When 0 is written to TDRE after reading TDRE = 1
When a TXI interrupt request is issued allowing DTC
to write data to TDR
When serial reception ends normally and receive data
is transferred from RSR to RDR
When 0 is written to RDRF after reading RDRF = 1
When an RXI interrupt request is issued allowing DTC
to read data from RDR
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