SH7280 Datasheet, PDF (868/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 17 Serial Communication Interface with FIFO (SCIF)
Initial
Bit
Bit Name Value R/W Description
1
RDF
0
R/(W)* Receive FIFO Data Full
Indicates that receive data has been transferred to the
receive FIFO data register (SCFRDR), and the
quantity of data in SCFRDR has become more than
the receive trigger number specified by the RTRG[1:0]
bits in the FIFO control register (SCFCR).
0: The quantity of transmit data written to SCFRDR is
less than the specified receive trigger number
[Clearing conditions]
• RDF is cleared to 0 by a power-on reset, standby
mode
• RDF is cleared to 0 when the SCFRDR is read
until the quantity of receive data in SCFRDR
becomes less than the specified receive trigger
number after 1 is read from RDF and then 0 is
written
• RDF is cleared to 0 when SCFRDR is read by the
DMAC until the quantity of receive data in
SCFRDR becomes less than the specified receive
trigger number.
• RDF is cleared to 0 when SCFRDR is read by the
DTC until the quantity of receive data in SCFRDR
becomes less than the specified receive trigger
number. (Except the transfer counter value of DTC
has become H'0000)
1: The quantity of receive data in SCFRDR is more
than the specified receive trigger number
[Setting condition]
• RDF is set to 1 when a quantity of receive data
more than the specified receive trigger number is
stored in SCFRDR*
Note: * As SCFTDR is a 16-byte FIFO register, the
maximum quantity of data that can be read
when RDF is 1 becomes the specified
receive trigger number. If an attempt is made
to read after all the data in SCFRDR has
been read, the data is undefined. The
quantity of receive data in SCFRDR is
indicated by the lower 8 bits of SCFDR.
Rev. 1.00 Jun. 26, 2008 Page 838 of 1692
REJ09B0393-0100