SH7708 datasheet(420/633 Pages) RENESAS

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14.2.1

Smart Card Mode Register (SCSCMR)

The smart card mode register (SCSCMR) is an 8-bit read/write register that selects smart card

interface functions. SCSMR bits 0, 2, and 3 are initialized to 0 by a reset and in standby mode.

Bit:

Bit name:

—

SDIR

SINV

—

SMIF

Initial value:

—

R/W:

R/W

Bits 7 to 4 and 1—Reserved: An undefined value will be returned if these bits are read.

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

Bit 3: SDIR

Description

Contents of SCTDR are transferred LSB first, receive data is stored in

SCRDR LSB first.

(Initial value)

Contents of SCTDR are transferred MSB first, receive data is stored in

SCRDR MSB first.

Bit 2—Smart Card Data Inversion (SINV): Specifies whether to invert the logic level of the data.

This function is used in combination with bit 3 for transmitting and receiving with an inverse

convention card. SINV does not affect the logic level of the parity bit. See section 14.3.4, Register

Settings, for information on how parity is set.

Bit 2: SINV

Description

Contents of SCTDR are transferred unchanged, receive data is stored in

SCRDR unchanged.

(Initial value)

Contents of SCTDR are inverted before transfer, receive data is inverted

before storage in SCRDR.

Bit 0—Smart Card Interface Mode Select (SMIF): Enables the smart card interface function.

Bit 0 : SMIF

Description

Smart card interface function disabled

(Initial value)

Smart card interface function enabled

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