r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 874

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
Smart Card Interface Mode (When SMIF bit in SCMR is 1)
Rev. 1.00 Sep. 19, 2008 Page 844 of 1342
REJ09B0467-0100
Bit
7
6
Bit Name
TDRE
RDRF
Initial Value
1
0
R/W
R/(W) *
R/(W) *
Description
Transmit Data Register Empty
Indicates whether TDR contains transmit data.
[Setting conditions]
•
•
[Clearing conditions]
•
•
Receive Data Register Full
Indicates that the received 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. Exercise care because if reception of the
next data is completed while the RDRF flag is set
to 1, an overrun error occurs and receive data will
be lost.
and data writing to TDR is enabled.
TDRE = 1
interrupt request and transfers data to TDR
receive data is transferred from RSR to RDR
RDRF = 1
RXI interrupt and transferred data from RDR
When the TE bit in SCR is 0
When data is transferred from TDR to TSR,
When 0 is written to TDRE after reading
When the DMAC or DTC is activated by a TXI
When serial reception ends normally and
When 0 is written to RDRF after reading
When the DMAC or DTC is activated by an