HD6413008VF25 Datasheet, PDF (387/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

12. Serial Communication Interface
For Serial Communication Interface (SMIF Bit in SCMR Cleared to 0): Indicates that when
the last bit of a serial character was transmitted TDR did not contain valid transmit data, so
transmission has ended. The TEND flag is a read-only bit and cannot be written.
Bit 2
TEND
0
1
Description
Transmission is in progress
[Clearing condition]
Read TDRE when TDRE = 1, then write 0 in TDRE
End of transmission
[Setting conditions]
• The chip is reset or enters standby mode
(Initial value)
• The TE bit in SCR is cleared to 0
• TDRE is 1 when the last bit of a 1-byte serial transmit character is
transmitted
For Smart Card Interface (SMIF Bit in SCMR Set to 1): Indicates that when the last bit of a
serial character was transmitted TDR did not contain valid transmit data, so transmission has
ended. The TEND flag is a read-only bit and cannot be written.
Bit 2
TEND
Description
0
Transmission is in progress
[Clearing condition]
Read TDRE when TDRE = 1, then write 0 in TDRE
1
End of transmission
[Setting conditions]
• The chip is reset or enters standby mode
(Initial value)
• The TE bit is cleared to 0 in SCR and the FER/ERS bit is also cleared to 0
• TDRE is 1 and FER/ERS is 0 (normal transmission) 2.5 etu (when GM = 0)
or 1.0 etu (when GM = 1) after a 1-byte serial character is transmitted
Note: etu: Elementary time unit (time required to transmit one bit)
Rev.4.00 Aug. 20, 2007 Page 341 of 638
REJ09B0395-0400