MN63Y1208 Datasheet, PDF (84/120 Pages) Panasonic Semiconductor – Built-in 4-Kbit FeRAM non-volatile memory with fast write and low power consumption

Chapter 6 Interrupt Generation Function
6.1 Interrupt Source
This RFID provides an NIRQ pin for interrupt output. A low output to the pin enables IRQ notification to notify
the host of generation of an interrupt.
Interrupt sources are described below.
Serial communication interrupt
An IRQ that is caused by serial communication and issued when processing of the command input from the
host is completed.
Serial communication interrupt cannot be masked.
RF communication detect interrupt
An IRQ that is caused by RF communication and issued either when RF response transmission is
completed or when a write to FeRAM with the RF command is completed.
The system area HW2 parameter's IRQSEL selects whether interrupt is generated and the interruput
source. Bit 2 selects whether interrupt is generated and bit 1 selects the interrupt source.
In addition, even when interrupt generation is enabled, the WREG command for serial command can mask
the IRQ.
Magnetic-field detect interrupt
An IRQ that is caused by RF magnetic-field detection and issued when an RF magnetic field by
reader/writer is detected.
Bit 0 of the system area HW2 parameter's IRQSEL selects whether interrupt is generated.
In addition, even when interrupt generation is enabled, the WREG command for serial command can mask
the IRQ.
While the contact power supply VDDEX is not applied, an IRQ is issued by starting a power supply due to
RF magnetis field. However, when RF magnetic field disappears, power supply will be stopped and low
output of the NIRQ pin will be stopped.
Any of the IRQs described above are canceled when the slave address is identified by a slave transmission
request from the host, and low output of the NIRQ pin will be stopped.
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