Register Descriptions; Smart Card Mode Register (Scmr) - Hitachi F-ZTAT H8/3039 Series Hardware Manual

12.2

Register Descriptions

Registers added with the Smart Card interface and bits for which the function changes are
described here.
12.2.1

Smart Card Mode Register (SCMR)

Bit
Initial value
Read/Write
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 cannot be modified and are always read as 1.
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
390
7 6
— —
1 1
— —
Reserved bits
5 4
— — SDIR
1 1
— — R/W
Smart card data transfer direction
Selects the serial/parallel conversion format
3 2
SINV
0 0
R/W
Smart card interface
mode select
Enables or disables
the smart card
interface function
Smart card data invert
Inverts data logic levels
0
1
— SMIF
1 0
— R/W
(Initial value)