426
13.2.2
Serial Status Register (SSR)
The function of SSR bit 4 is modified in smart card interface mode. This change also causes a
modification to the setting conditions for bit 2 (TEND).
7
TDRE
1
R/(W)
*
6
RDRF
0
R/(W)
*
5
ORER
0
R/(W)
*
4
ERS
0
R/(W)
*
3
PER
0
R/(W)
*
0
MPBT
0
R/W
2
TEND
1
R
1
MPB
0
R
Bit
Initial value
Read/Write
Transmit end
Status flag indicating end
of transmission
Error signal status (ERS)
Status flag indicating that an error
signal has been received
Note:
*
Only 0 can be written, to clear the flag.
Bits 7 to 5: These bits operate as in normal serial communication. For details see section 12.2.7,
Serial Status Register (SSR).
Bit 4—Error Signal Status (ERS): In smart card interface mode, this flag indicates the status of
the error signal sent from the receiving device to the transmitting device. The smart card interface
does not detect framing errors.
Bit 4
ERS
Description
0
Indicates normal transmission, with no error signal returned
(Initial value)
[Clearing conditions]
•
The chip is reset, or enters standby mode or module stop mode
•
Software reads ERS while it is set to 1, then writes 0.
1
Indicates that the receiving device sent an error signal reporting a parity error
[Setting condition]
A low error signal was sampled.
Note:
Clearing the TE bit to 0 in SCR does not affect the ERS flag, which retains its previous
value.
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