505
14.2.2
Serial Status Register (SSR)
Bit
:
7
6
5
4
3
2
1
0
TDRE
RDRF
ORER
ERS
PER
TEND
MPB
MPBT
Initial value :
1
0
0
0
0
1
0
0
R/W
:
R/(W)
*
R/(W)
*
R/(W)
*
R/(W)
*
R/(W)
*
R
R
R/W
Note:
*
Only 0 can be written, to clear these flags.
Bit 4 of SSR has a different function in Smart Card interface mode. Coupled with this, the setting
conditions for bit 2, TEND, are also different.
Bits 7 to 5—Operate in the same way as for the normal SCI. For details, see section 13.2.7, Serial
Status Register (SSR).
Bit 4—Error Signal Status (ERS): In Smart Card interface mode, bit 4 indicates the status of the
error signal sent back from the receiving end in transmission. Framing errors are not detected in
Smart Card interface mode.
Bit 4
ERS
Description
0
Normal reception, with no error signal
[Clearing conditions]
(Initial value)
•
Upon reset, and in standby mode or module stop mode
•
When 0 is written to ERS after reading ERS = 1
1
Error signal sent from receiver indicating detection of parity error
[Setting condition]
When the low level of the error signal is sampled
Note:
Clearing the TE bit in SCR to 0 does not affect the ERS flag, which retains its previous
state.
Summary of Contents for H8S/2645
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