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* Detailed Description:
* Enable external interrupt on pin PA[3].
* If falling edge is detected, interrupt is triggered and LED1 on PE[4] is
* toggled.
*
* Connect external signal to PA[3] or connect push button by wire.
*
* ------------------------------------------------------------------------------
* Test HW: TRK-MPC5606B, SPC5606B 0N32E
* Target : internal_FLASH, RAM
* Fsys: 64 MHz PLL with 8 MHz crystal reference
*
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