Rev. 1.0, 09/02, page 302 of 568
14.3.7
Serial Status Register (SSR)
SSR is a register containing status flags of the SCI and multiprocessor bits for transfer. 1 cannot
be written to flags TDRE, RDRF, ORER, PER, and FER; they can only be cleared. Some bit
functions of SSR differ between normal serial communication interface mode and Smart Card
interface mode.
•
Normal Serial Communication Interface Mode (When SMIF in SCMR is 0)
Bit
Bit Name
Initial Value
R/W
Description
7
TDRE
1
R/W
Transmit Data Register Empty
Displays 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
•
When the DTC is activated by a TXI interrupt
request and writes data to TDR
6
RDRF
0
R/W
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
•
When the DTC 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.
Summary of Contents for H8S/2627
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