Common files stored here:
<mcuseries>.h	     MCU series header file
gpio.h		     Used for PDL and Pin & Code Wizard to configure the GPIOs
		     The specific package is configures in RTE_Device.h
		     The GPIO definition for every package is saved in gpio_<mcuname>.h
		     mcu.h includes the gpio_<mcuname>.h file
gpio_<mcuname>.h     GPIO definition for package of MCU series
fgpio.h              Fast GPIO module version of gpio.h
base_types.h         Type definition specific for the MCU (like uint8_t, boolean_t, result_t, etc.)
system_<mcuseries>.h System configuration like clocks, HW Watchdog, etc.
system_<mcuseries>.c System configuration initialization