SH7721 datasheet(664/1524 Pages) RENESAS

664 / 1524 page

Section 18

Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Jan. 18, 2008 Page 602 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial Value

R/W

Description

TEND

Transmit End

Indicates that when the last bit of a serial character was

transmitted, the SCFTDR did not contain valid data, so

transmission has ended.

0: Transmission is in progress

[Clearing condition]

Data is written to SCFTDR.

1: End of transmission

[Setting condition]

SCFTDR contains no transmit data when the last bit of a one-

byte serial character is transmitted.

TDFE

R/(W)*

Transmit FIFO Data Empty

Indicates that data is transferred from the transmit FIFO data

number of data in SCFTDR becomes less than the number of

transmission triggers specified by the TTRG1 and TTRG0 bits

in the FIFO control register (SCFCR), and writing the transmit

data to SCFTDR is enabled.

0: The number of transmit data written to SCFTDR is greater

than the specified number of transmission triggers

[Clearing condition]

Data exceeding the specified number of transmission

triggers is written to SCFTDR, software reads TDFE after it

has been set to 1, then writes 0 to TDFE.

1: The number of transmission data in SCFTDR becomes less

than the specified number of transmission triggers

[Setting conditions]

•

Power-on reset, manual reset

•

The number of transmission data in SCFTDR becomes

less than the specified number of transmission triggers as

a result of transmission*

Note:

Since SCFTDR is a 64-byte FIFO register, the

maximum number of data which can be written

when TDFE is 1 is "64 minus the specified

number of transmission triggers". If attempted to

write additional data, the data is ignored. The

number of data in SCFTDR is indicated by

SCFDR.

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