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Section 13 Serial Communication Interface
For smart card interface (SMIF bit in SCMR set to 1): Indicates the status of the error signal
sent back from the receiving side during transmission. Framing errors are not detected in smart
card interface mode.
Bit 4
ERS
Description
0
Normal reception, no error signal*
Clearing conditions
The chip is reset or enters standby mode
Read ERS when ERS = 1, then write 0 in ERS
1
An error signal has been sent from the receiving side indicating detection of a
parity error
Setting condition
The error signal is low when sampled
Note: * Clearing the TE bit to 0 in SCR does not affect the ERS flag, which retains its previous
value.
Bit 3—Parity Error (PER): Indicates that data reception ended abnormally due to a parity error
in asynchronous mode.
Bit 3
PER
Description
Receiving is in progress or has ended normally *
0
Clearing conditions
The chip is reset or enters standby mode
Read PER when PER = 1, then write 0 in PER
A receive parity error occurred *
1
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.
Rev. 4.00 Jan 26, 2006 page 496 of 938
REJ09B0276-0400
1
2
(Initial value)
(Initial value)
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