HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 455

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

• Smart card interface mode (when SMIF in SDCR is 1)
Bit
7
6
Bit Name Initial Value
TDRE
RDRF
1
0
R/W
R/(W)* Transmit Data Register Empty
R/(W)* Receive Data Register Full
Description
Indicates whether TDR contains transmit data.
[Setting conditions]
•
•
•
[Clearing conditions]
•
•
•
Indicates that the receive data is stored in RDR.
[Setting condition]
•
[Clearing conditions]
•
•
•
•
The RDRF flag is not affected and retains its previous
value even if the RE bit in SCR is cleared to 0.
If reception of the next data is completed while the
RDRF flag is still set to 1, an overrun error will occur
and the receive data will be lost.
Power-on reset or software standby mode
When the TE bit in SCR is 0
When data is transferred from TDR to TSR
When 0 is written to TDRE after reading TDRE = 1
When the DMAC is activated by a TXI interrupt
When the DTC is activated by a TXI interrupt and
transmit data is transferred to TDR while the
DISEL bit in DTMR of the DTC is 0
When serial reception ends normally and receive
data is transferred from RSR to RDR
Power-on reset or software standby mode
When 0 is written to RDRF after reading RDRF =
1
When the DMAC is activated by an RXI interrupt
When the DTC is activated by an RXI interrupt
and data is transferred from RDR while the DISEL
bit in DTMR of the DTC is 0
13. Serial Communication Interface (SCI)
Rev.4.00 Mar. 27, 2008 Page 411 of 882
REJ09B0108-0400