SH7619_09 Datasheet, PDF (433/860 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7619 Series

Section 15 Serial Communication Interface with FIFO (SCIF)
Initial
Bit
Bit Name value R/W Description
5
TDFE
0
R/(W)* Transmit FIFO Data Empty
Indicates that data has been transferred from the
transmit FIFO data register (SCFTDR) to the transmit
shift register (SCTSR), the number of data in
SCFTDR has become less than the transmission
trigger number specified by the TTRG1 and TTRG0
bits in the FIFO control register (SCFCR), and writing
of transmit data to SCFTDR is enabled.
0: The number of transmit data written to SCFTDR is
greater than the specified transmission trigger
number
[Clearing conditions]
• TDFE is cleared to 0 when data exceeding the
specified transmission trigger number is written to
SCFTDR after 1 is read from the TDFE bit and
then 0 is written
• TDFE is cleared to 0 when DMAC write data
exceeding the specified transmission trigger
number to SCFTDR
1: The number of transmit data in SCFTDR is equal to
or less than the specified transmission trigger
number*
[Setting conditions]
• TDFE is set to 1 by a power-on reset
• TDFE is set to 1 when the number of transmit data
in SCFTDR has become equal to or less than the
specified transmission trigger number as a result
of transmission
Note: * Since SCFTDR is a 16-byte FIFO register,
the maximum number of data that can be
written when TDFE is 1 is "16 minus the
specified transmission trigger number". If an
attempt is made to write additional data, the
data is ignored. The number of data in
SCFTDR is indicated by the upper 8 bits of
SCFDR.
Rev. 6.00 Jul. 15, 2009 Page 393 of 816
REJ09B0237-0600