Use automatic code generation and some of your own code to create the following variations. Therequirements for each program are that:$$ Uses a $4$MHz MSI system clock.$$ Use PA$0$ to drive LED transistor and blink an LED with a period of $2$ seconds $(1$ second on$,$ onsecond off$).$ Monitor Pin PC$13($the User Button$).$ Note that this pin will need an internal pull$-$up resistor andthe button will connect to ground.$$ Disable all other pins and clocks $($except on RTC program, then leave the LSE power and thepins assigned to PC$14$ and PC$15)$The low power states to be used in most of the programs are trigger by the following code.$//$HAL$\_$PWR$\_$EnterSLEEPMode$($PWR$\_$MAINREGULATOR$\_$ON$,$PWR$\_$SLEEPENTRY$\_$WFI$)$;$//$HAL$\_$PWR$\_$EnterSLEEPMode$($PWR$\_$LOWPOWERREGULATOR$\_$ON$,$PWR$\_$SLEEPENTRY$\_$WFI$)$;$//$HAL$\_$PWREx$\_$EnterSTOP$0$Mode$($PWR$\_$STOPENTRY$\_$WFI$)$;$//$HAL$\_$PWREx$\_$EnterSTOP$1$Mode$($PWR$\_$STOPENTRY$\_$WFI$)$;$//$HAL$\_$PWREx$\_$EnterSTOP$2$Mode$($PWR$\_$STOPENTRY$\_$WFI$)$;$//$HAL$\_$PWREx$\_$EnterSHUTDOWNMode$()$;These can be uncommented to put the program into a $\_\_$WFI$()($Wait$-$for$-$interrupt$)$ in various low$-$powerstates. Place these functions in while$(1)$ loop.The programs that are to be generated area. Blink with CPU clocki. Counts a volatile variable inside the CPU program to create the period. How do you foind the period