HD6417618 datasheet(373/646 Pages) RENESAS

373 / 646 page

Section 14 Serial Communication Interface with FIFO (SCIF)

Rev. 6.00 Jun. 12, 2007 Page 341 of 610

REJ09B0131-0600

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 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

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 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

1: The number of transmit data in SCFTDR is equal to

or less than the specified transmission trigger

number*

[Setting conditions]

• 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

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

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.

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