HD64F2168 Datasheet, PDF (406/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

• 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 conditions]
• When 0 is written to TDRE after reading TDRE =
1
6
RDRF
0
• When a TXI interrupt request is issued allowing
DTC to write data to TDR
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 conditions]
• When 0 is written to RDRF after reading RDRF
=1
• When an RXI interrupt request is issued
allowing DTC to read data from RDR
The RDRF flag is not affected and retains its
previous value when the RE bit in SCR is cleared
to 0.
5
ORER
0
R/(W)*¹ 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
4
ERS
0
R/(W)*¹ Error Signal Status
[Setting condition]
When a low error signal is sampled
[Clearing condition]
When 0 is written to ERS after reading ERS = 1
Rev. 3.00, 03/04, page 366 of 830