HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 373

• Manufacturer Part Number: HD6417618
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Bit
5
Bit Name
TDFE
Initial
value
0
R/W
R/(W)* Transmit FIFO Data Empty
Section 14 Serial Communication Interface with FIFO (SCIF)
Description
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
[Clearing conditions]
•
•
1: The number of transmit data in SCFTDR is equal to
[Setting conditions]
•
•
Note: * Since SCFTDR is a 16-byte FIFO register,
or less than the specified transmission trigger
number*
greater than the specified transmission trigger
number
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
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
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 Jun. 12, 2007 Page 341 of 610
REJ09B0131-0600