R5S72011 RENESAS [Renesas Technology Corp], R5S72011 Datasheet - Page 711

• Manufacturer Part Number: R5S72011
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Bit
5
Bit Name
TDFE
Initial
Value
1
R/W
R/(W)* Transmit FIFO Data Empty
Section 16 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 quantity 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 quantity of transmit data written to SCFTDR is
[Clearing conditions]
•
•
1: The quantity of transmit data in SCFTDR is less
[Setting conditions]
•
•
Note: 1. Since SCFTDR is a 16-byte FIFO register,
greater than the specified transmission trigger
number
than or equal to 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 TDFE and then 0 is
written
TDFE is cleared to 0 when the DMAC is activated
by the transmit FIFO data empty interrupt (TXI)
and writes 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 quantity of transmit
data in SCFTDR becomes less than or equal to
the specified transmission trigger number as a
result of transmission
the maximum quantity 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 quantity of data in
SCFTDR is indicated by the upper 8 bits of
SCFDR.
1
Rev. 2.00 Sep. 07, 2007 Page 683 of 1164
REJ09B0321-0200