73S8010R
Low Cost Smart Card Interface
DATA SHEET
INTERRUPT
Interrupt is an active low interrupt. It is set low if any of these internal faults are detected:
-VCC fault
-VDD fault
-VPC fault
Or if one of these status bits condition is detected:
-Early ATR
-Mute ATR
-Card insert or card extract
-Protection status from Over-current or Over-heating
In case the interrupt is set low by the detection of these status bits, then the interrupt is set high when these
status bits are read. (READ STATUS DONE)
INT
ANY FAULT
STATUS BITS
READ STATUS DONE
Figure 7 - FAULT Functions, INT operation
Note that a power-on-reset event will reset all of the control and status registers to their default states. A VDD fault
event does not reset these registers, but it will signal an interrupt condition and by the action of the timer that
creates interval “t1,” not clearing the interrupt until VDD is valid for at least t1. VDD fault can be considered valid for
VDD as low as 1.5 to 1.8 volts. At the lower range of VDD fault, POR will be asserted.
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