SDL interrupt issues

Hi Guys

New on here but have been using SDL via an engine to create Android apps for a few years now.
I have a problem where I can get my ads to show when I jump out of the app to the home screen.

What I am looking for is a quick / seemless jump out & back in method in SDL to use to interrupt the game for a brief moment - enough for the display change to register thus firing the ads instance - I hope.

Can anyhow offer any advice on this please?