H8SSLASH2218 datasheet(475/750 Pages) RENESAS

475 / 750 page

Section 12 Serial Communication Interface

Rev.6.00 Jun. 03, 2008 Page 427 of 698

REJ09B0074-0600

12.7

Operation in Smart Card Interface

The SCI supports an IC card (Smart Card) interface that conforms to ISO/IEC 7816-3

(Identification Card) as a serial communication interface extension function. Switching between

the normal serial communication interface and the Smart Card interface mode is carried out by

means of a register setting.

12.7.1

Pin Connection Example

Figure 12.24 shows an example of connection with the Smart Card. In communication with an IC

card, as both transmission and reception are carried out on a single data transmission line, the TxD

pin and RxD pin should be connected to the LSI pin. The data transmission line should be pulled

up to the VCC power supply with a resistor. If an IC card is not connected, and the TE and RE bits

are both set to 1, closed transmission/reception is possible, enabling self-diagnosis to be carried

out. When the clock generated on the Smart Card interface is used by an IC card, the SCK pin

output is input to the CLK pin of the IC card. This LSI port output is used as the reset signal.

TxD

RxD

This LSI

VCC

I/O

Connected equipment

IC card

Data line

Clock line

Reset line

CLK

RST

SCK

Px (port)

Figure 12.24 Schematic Diagram of Smart Card Interface Pin Connections

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