Datasheet

Table Of Contents
Section 13 Serial Communication Interface
REJ09B0140-0900 Rev. 9.00 Page 399 of 846
Sep 16, 2010
H8S/2215 Group
Smart Card Interface Mode (When SMIF in SCMR is 1)
Bit Bit Name Initial Value R/W Description
7 TDRE 1 R/(W)
*
1
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 data
can be written to TDR
[Clearing conditions]
When 0 is written to TDRE after reading TDRE = 1
*
3
When the DMAC or the DTC
*
2
is activated by a TXI
interrupt request and writes data to TDR
6 RDRF 0 R/(W)
*
1
Receive Data Register Full
Indicates that the received 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
*
3
When the DMAC or the DTC
*
2
is activated by an RXI
interrupt and transferred data from RDR
The RDRF flag is not affected and retains their previous
values when 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.