Write and execute a program that display characters $"$O$"$ in blinking mode when external switch SW$0$ is pressed and display characters $"$O$"$ one by one starting with $($A$,$B$,$C$,$D$,$E$,$F$)$ as shown in Figure Q$8$a when switch SW$1($User B$1)$ is pressed. The connection between all devices is shown in Figure Q$8$b$.$ Load the program to the microcontroller and explain the result.

Figure Q$8$a: $7-$segment LED display