Register Descriptions; Smart Card Mode Register (Scmr) - Hitachi H8S/2646 Hardware Manual

14.2

Register Descriptions

Registers added with the Smart Card interface and bits for which the function changes are
described here.
14.2.1

Smart Card Mode Register (SCMR)

Bit : 7
—
Initial value : 1
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: It is 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
6 5
— — —
1 1
— — —
4 3 2
SDIR SINV
1 0 0
R/W R/W
1 0
— SMIF
1 0
— R/W
(Initial value)
503