How to use the STM8S103 external interrupt, one of the keys to use low detection, generate IO interrupt, to light a LED light

BUTTON_LED\Debug\Exe\reg_led.out
..........\.....\main.ls
..........\.....\main.o
..........\.....\Obj\main.o
..........\.....\...\reg_led.pbd
..........\.....\...\stm8s_it.o
..........\.....\reg_led.elf
..........\.....\reg_led.lkf
..........\.....\reg_led.map
..........\.....\reg_led.s19
..........\.....\reg_led.sm8
..........\.....\stm8s_it.ls
..........\.....\stm8s_it.o
..........\.....\stm8_interrupt_vector.ls
..........\.....\stm8_interrupt_vector.o
..........\main.c
..........\reg_led.dep
..........\reg_led.ewd
..........\reg_led.ewp
..........\reg_led.eww
..........\reg_led.pdb
..........\Release\reg_led.lkf
..........\settings\reg_led.cspy.bat
..........\........\reg_led.dbgdt
..........\........\reg_led.dni
..........\........\reg_led.wsdt
..........\stm8s.h
..........\stm8s_it.c
..........\stm8s_it.h
..........\stm8s_type.h
..........\type.h
..........\Debug\Exe
..........\.....\List
..........\.....\Obj
..........\Debug
..........\Release
..........\settings
BUTTON_LED

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