3069RF-ZTAT Datasheet, PDF (495/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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
(Initial value)
[Setting conditions]
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
(Initial value)
[Setting conditions]
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)
Bit 1—Multiprocessor bit (MPB): Stores the value of the multiprocessor bit in the receive data
when a multiprocessor format is used in asynchronous mode. MPB is a read-only bit, and cannot
be written.
Bit 1
MPB
Description
0
Multiprocessor bit value in receive data is 0*
(Initial value)
1
Multiprocessor bit value in receive data is 1
Note: * If the RE bit in SCR is cleared to 0 when a multiprocessor format is selected, MPB
retains its previous value.
Rev. 5.0, 09/04, page 473 of 978