H8S2245 datasheet(472/818 Pages) RENESAS

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Section 12 Serial Communication Interface (SCI)

Rev.3.00 Mar. 26, 2007 Page 430 of 772

REJ09B0355-0300

12.2.9

Smart Card Mode Register (SCMR)

—

SDIR

R/W

SMIF

R/W

SINV

R/W

—

Bit

Initial value

R/W

SCMR selects LSB-first or MSB-first by means of bit SDIR. With an 8-bit length, LSB-first or

MSB-first transfer 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 13.2.1, Smart Card Mode Register (SCMR).

SCMR is initialized to H'F2 by a reset, and in standby mode or module stop mode.

Bits 7 to 4—Reserved: Read-only bits, always read as 1.

Bit 3—Smart Card Data Transfer Direction (SDIR): Selects the serial/parallel conversion

format.

The transfer format is valid for 8-bit data.

Bit 3

SDIR

Description

TDR contents are transmitted LSB-first

(Initial value)

Receive data is stored in RDR LSB-first

TDR contents are transmitted MSB-first

Receive data is stored in RDR MSB-first

Bit 2—Smart Card Data Invert (SINV): When the smart card interface operates as a normal

SCI, 0 should be written in this bit.

Bit 1—Reserved: Read-only bit, always read as 1.

Bit 0—Smart Card Interface Mode Select (SMIF): When the smart card interface operates as a

normal SCI, 0 should be written in this bit.

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