SH7708 datasheet(423/633 Pages) RENESAS

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14.3.2

Pin Connections

Figure 14.2 shows the pin connection diagram for the smart card interface. During communication

with an IC card, transmission and reception are both carried out over the same data transfer line,

so connect the TxD and RxD pins on the chip. Pull up the data transfer line to the power supply

VCC side with a resistor.

When using the clock generated by the smart card interface on an IC card, input the SCK pin

output to the IC card’s CLK pin. This connection is not necessary when the internal clock is used

on the IC card.

Use the chip’s port output as the reset signal. Apart from these pins, the power and ground pin

connections are usually also required.

Note:

When the IC card is not connected and both RE and TE are set to 1, closed communication

is possible and auto-diagnosis can be performed.

LSI

TxD

CLK

RST

RxD

SCK

Px (port)

Clock line

Data line

Reset line

IC card

Connected device

VCC

Figure 14.2 Pin Connection Diagram for the Smart Card Interface

SH7708 bảng dữ liệu(PDF) 423 Page - Renesas Technology Corp