H8S2245 datasheet(522/818 Pages) RENESAS

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Section 13 Smart Card Interface

Rev.3.00 Mar. 26, 2007 Page 480 of 772

REJ09B0355-0300

13.2.3

Serial Mode Register (SMR)

Bit

543210

CHR

STOP

CKS1

CKS0

Initial value :

000000

Set value* :GM

CKS1

CKS0

R/W

Note:

When the smart card interface is used, be sure to make the 0 or 1 setting shown for bits

6, 5, 3, and 2.

The function of bit 7 of SMR changes in smart card interface mode.

Bit 7—GSM Mode (GM): Sets the smart card interface function to GSM mode.

This bit is cleared to 0 when the normal smart card interface is used. In GSM mode, this bit is set

to 1, the timing of setting of the TEND flag that indicates transmission completion is advanced

and clock output control mode addition is performed. The contents of the clock output control

mode addition are specified by bits 1 and 0 of the serial control register (SCR).

Bit 7

Description

Normal smart card interface mode operation

(Initial value)

• TEND flag generation 12.5 etu after beginning of start bit

• Clock output ON/OFF control only

GSM mode smart card interface mode operation

• TEND flag generation 11.0 etu after beginning of start bit

• High/low fixing control possible in addition to clock output ON/OFF control (set by

SCR)

Note:

etu: Elementary time unit (time for transfer of 1 bit)

Bits 6 to 0—Operate in the same way as for the normal SCI.

For details, see section 12.2.5, Serial Mode Register (SMR).

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