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

13.2.9

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 section 14.2.1, Smart Card Mode Register (SCMR).
SCMR is initialized to H'F2 by a reset and in standby mode.
Bits 7 to 4—Reserved: It is 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
456
7 6 5
— —
1 1 1
— —
4 3 2
— SDIR SINV
1 0 0
— R/W R/W
1 0
— SMIF
1 0
— R/W
(Initial value)