SH7713 datasheet(588/904 Pages) RENESAS

588 / 904 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev.1.50 Aug. 30, 2006 Page 548 of 860

REJ09B0288-0150

Bit

Bit Name

Initial

Value

R/W

Description

TDFE

R/(W)*

Transmit FIFO Data Empty

Indicates that data has been transferred from

SCFTDR to SCTSR, the number of data bytes in

SCFTDR has been equal to or below the transmit

trigger data number set by bits TTRG1 and TTRG0

in SCFCR, and new transmit data can be written to

SCFTDR.

0: A number of transmit data bytes exceeding the

transmit trigger set number have been written to

SCFTDR

[Clearing conditions]

• When transmit data exceeding the transmit

trigger set number is written to SCFTDR, and 0

is written to the TDFE bit after reading TDFE = 1

• When transmit data exceeding the transmit

trigger set number is written to SCFTDR by the

DMAC

1: The number of transmit data bytes in SCFTDR

does not exceed the transmit trigger set number

[Setting conditions]

• Power-on reset or manual reset

• When the number of SCFTDR transmit data

bytes is equal to or below the transmit trigger

set number as the result of a transmit operation*

Note: * As SCFTDR is a 16-byte FIFO register, the

maximum number of bytes that can be

written when TDFE = 1 is 16 – (transmit

trigger set number). Data written in excess

of this will be ignored. The number of data

bytes in SCFTDR is indicated by the upper

bits in SCFDR.

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