Datasheet

Section 15 Serial Communication Interface (SCI)
Rev. 3.00 Sep. 28, 2009 Page 414 of 910
REJ09B0350-0300
Bit Bit Name Initial Value R/W Description
1 MPB 0 R Multiprocessor Bit
MPB stores the multiprocessor bit in the receive
frame. When the RE bit in SCR is cleared to 0 its
previous state is retained.
0 MPBT 0 R/W Multiprocessor Bit Transfer
MPBT stores the multiprocessor bit to be added to
the transmit frame.
Note: * Only 0 can be written to clear the flag.
• Bit Functions in Smart Card Interface Mode (when SMIF in SCMR = 1)
Bit Bit Name Initial Value R/W Description
7 TDRE 1 R/(W)* Transmit Data Register Empty
Indicates whether TDR contains transmit data.
[Setting conditions]
• When the TE bit in SCR is 0
• When data is transferred from TDR to TSR, and
TDR can be written to.
[Clearing condition]
When 0 is written to TDRE after reading TDRE = 1
6 RDRF 0 R/(W)*
1
Receive Data Register Full
Indicates that receive data is stored in RDR.
[Setting condition]
When serial reception ends normally and receive
data is transferred from RSR to RDR
[Clearing condition]
When 0 is written to RDRF after reading RDRF = 1
The RDRF flag is not affected and retains its
previous value when the RE bit in SCR is cleared
to 0.