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17.2
Register Descriptions
Registers added with the Smart Card interface and bits for which the function changes are
described here.
17.2.1
Smart Card Mode Register (SCMR)
Bit
:
Initial value :
R/W
:
SCMR is an 8-bit readable/writable register that selects the Smart Card interface function.
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.
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
664
7
6
—
—
1
1
—
—
5
4
—
—
SDIR
1
1
—
—
3
2
SINV
0
0
R/W
R/W
1
0
—
SMIF
1
0
—
R/W
(Initial value)
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