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Bit 3—Parity Error (PER): Indicates that data reception ended abnormally due to a parity error
in asynchronous mode.
Bit 3
PER
Description
0
Receiving is in progress or has ended normally*
[Clearing conditions]
The chip is reset or enters standby mode. Software reads PER while it is
set to 1, then writes 0.
1
A receive parity error occurred*
[Setting condition]
The number of 1s in receive data, including the parity bit, does not
match the even or odd parity setting of O/E in SMR.
Notes: 1. Clearing the RE bit to 0 in SCR does not affect the PER flag, which retains its previous
value.
2. When a parity error occurs the SCI transfers the receive data into RDR but does not set
the RDRF flag. Serial receiving cannot continue while the PER flag is set to 1. In
synchronous mode, serial transmitting is also disabled.
Bit 2—Transmit End (TEND): Indicates that when the last bit of a serial character was
transmitted TDR did not contain new 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]
Software reads TDRE while it is set to 1, then writes 0 in the TDRE flag.
1
End of transmission
[Setting conditions]
The chip is reset or enters standby mode. The TE bit is cleared to 0 in
SCR.
TDRE is 1 when the last bit of a serial character is transmitted.
340
1
2
(Initial value)
(Initial value)
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