HD6413007F20 Datasheet, PDF (475/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

13. 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 conditions]
• Read TDRE when TDRE = 1, then write 0 in TDRE
• The DMAC writes data in TDR
End of transmission
[Setting conditions]
(Initial value)
• The chip is reset or enters standby mode
• 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 conditions]
• Read TDRE when TDRE = 1, then write 0 in TDRE
• The DMAC writes data in TDR
1
End of transmission
[Setting conditions]
(Initial value)
• The chip is reset or enters standby mode
• 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.5.00 Sep. 12, 2007 Page 445 of 764
REJ09B0396-0500