SH7709S Datasheet, PDF (539/807 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

15.3.2 Pin Connections
Figure 15.2 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
V_CC side with a register.
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, 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.
V_CC
TxD
RxD
SCK
Px (port)
LSI
Connected device
Data line
Clock line
Reset line
IO
CLK
RST
IC card
Figure 15.2 Pin Connection Diagram for Smart Card Interface
Rev. 5.00, 09/03, page 495 of 760