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17.3.2
Pin Connections
Figure 17.2 shows a schematic diagram of smart card interface related pin connections.
In communication with an IC card, since both transmission and reception are carried out on a
single data transmission line, the TxD pin and RxD pin should be connected outside the chip. The
data transmission line should be pulled up on the V CC power supply side with a resistor. The TxD
pin is multiplexed with MD7, so caution is required in a reset.
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. No connection is needed if the IC card uses an internal clock.
Chip port output is used as the reset signal.
Other pins must normally be connected to the power supply or ground.
Note: If an IC card is not connected, and both TE and RE are set to 1, closed
transmission/reception is possible, enabling self-diagnosis to be carried out.
Connected equipment
Figure 17.2 Schematic Diagram of Smart Card Interface Pin Connections
TxD
RxD
SCK
SH7750
Px (port)
Series
V
CC
IO
Data line
Clock line
CLK
Reset line
RST
Rev. 4.0, 04/00, page 619 of 850
IC card
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