HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 490

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev. 1.00, 02/04, page 452 of 804
Bit
6
5
Bit Name
TEND
TDFE
Initial
Value R/W
1
1
R
R/(W)* Transmit FIFO Data Empty
Description
Transmit End
Indicates that there is no valid data in SCFTDR when the last
bit of the transmit character is sent, and transmission has
been ended.
0: Transmission is in progress
[Clearing condition]
When data is written to SCFTDR
1: Transmission has been ended
[Setting condition]
When there is no transmit data in SCFTDR on transmission of
a 1-byte serial transmit character
Indicates that data has been transferred from SCFTDR to
SCTSR, the number of data bytes in SCFTDR has fallen to or
below the transmit trigger data number set by bits TTRG1 and
TTRG0 in the FIFO control register (SCFCR), and new
transmit data can be written to SCFTDR.
0: A number of transmit data bytes exceeding the transmit
[Clearing condition]
When transmit data exceeding the transmit trigger set number
is written to SCFTDR, and 0 is written to TDFE after reading
TDFE = 1
1: The number of transmit data bytes in SCFTDR does not
[Setting conditions]
•
•
Note: 1. As SCFTDR is a 64-byte FIFO register, the
trigger set number have been written to SCFTDR
exceed the transmit trigger set number
Power-on reset or manual reset
When the number of SCFTDR transmit data bytes falls to
or below the transmit trigger set number as the result of a
transmit operation*
maximum number of bytes that can be written when
TDFE = 1 is 64 – (transmit trigger set number). Data
written in excess of this will be ignored. The number
of data bytes in SCFTDR is indicated by SCFDR.
1