C1
VCC
+5 VDC power supply input (optional use by the card)
C2
RESET
Reset signal, used to reset the card's communications. Either used itself (reset signal supplied from the interface device) or in combination with an interal reset control circuit (optional use by the card). If internal reset is implemented, the voltage supply
on Vcc is mandatory
C3
CLOCK
Provides the card with a clock signal, from which data communications timing is derived
C4
RESERVED
AUX1, optionally used for USB interfaces and other uses.
C5
GND
Ground (reference voltage)
C6
Vpp
Programing voltage input (optional). This contact may be used to supply the voltage required to program or to erase the internal non-volatile memory. ISO/IEC 7816-3:1997 designated this as a programming voltage: an input for a higher voltage to program persistent
memory (e.g., EEPROM). ISO/IEC 7816-3:2006 designates it SPU, for either standard or proprietary use, as input and/or output.
C7
I/O
Input or Output for serial data (half-duplex) to the integrated circuit inside the card.
C8
RESERVED
AUX2, optionally used for USB interfaces and other uses.
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