HD6417706 Datasheet, PDF (480/709 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

Bit
Bit Name Initial Value R/W Description
5
TDFE
1
R/(W)* Transmit FIFO Data Empty
Indicates that data is transferred from SCFTDR2
to SCTSR2, the quantity of data in SCFTDR2
becomes less than the number of transmission
triggers specified by the TTRG1 and TTRG0 bits
in SCFCR2, and writing the transmit data to
SCFTDR is enabled.
0: The quantity of transmit data written to
SCFTDR2 is equal to or greater than the
specified number of transmission triggers.
[Clearing condition]
When data exceeding the specified number of
transmission triggers is written to SCFTDR2,
software reads TDFE after it has been set to 1,
then writes 0 to TDFE
1: End of transmission
[Setting conditions]
1. The chip is power-on reset or enters
standby mode.
2. The quantity of transmission data in
SCFTDR2 becomes less than the specified
number of transmission triggers as a result
of transmission.
Note: Since SCFTDR2 is a 16-byte FIFO
register, the maximum quantity of data
which can be written when TDFE is 1 is
"16 minus the specified number of
transmission triggers". If attempted to
write additional data, the data is ignored.
The quantity of data in SCFTDR2 is
indicated by the upper 8 bits of
SCFTDR2.
Rev. 4.00, 03/04, page 434 of 660