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16.2.9
Smart Card Mode Register (SCMR)
Bit
:
Initial value
:
R/W
:
SCMR selects LSB-first or MSB-first by means of bit SDIR. Except in the case of asynchronous
mode 7-bit data, LSB-first or MSB-first can be selected regardless of the serial communication
mode. The descriptions in this chapter refer to LSB-first transfer.
For details of the other bits in SCMR, see 17.2.1, Smart Card Mode Register (SCMR).
SCMR is initialized to H'F2 by a reset and in standby mode.
Bits 7 to 4—Reserved: These bits are always read as 1 and cannot be modified.
Bit 3—Smart Card Data Transfer Direction (SDIR): Selects the serial/parallel conversion
format.
This bit is valid when 8-bit data is used as the transmit/receive format.
Bit 3
SDIR
Description
0
TDR contents are transmitted LSB-first
Receive data is stored in RDR LSB-first
1
TDR contents are transmitted MSB-first
Receive data is stored in RDR MSB-first
7
6
—
—
1
1
—
—
5
4
—
—
SDIR
1
1
—
—
R/W
3
2
SINV
0
0
R/W
1
0
—
SMIF
1
0
—
R/W
(Initial value)
611
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