SH7261 datasheet(719/1348 Pages) RENESAS

719 / 1348 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev. 2.00 Sep. 07, 2007 Page 687 of 1312

REJ09B0320-0200

Bit

Bit Name

Initial

Value

R/W

Description

TDFE

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 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

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 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

1: The quantity of transmit data in SCFTDR is less

than or equal to the specified transmission trigger

number*

[Setting conditions]

• 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

Note: 1. Since SCFTDR is a 16-byte FIFO register,

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.

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