The function provides an output pulse after a delay.
When S switches ON, the delay t₁ starts.
After t₁ expires, the output R switches ON for t₂.
After t₂ expires, R switches OFF.
During t₂, S has no influence on R.
When S switches ON, the delay t₁ starts.
After t₁ expires, the output R switches ON for t₂.
After t₂ expires, R switches OFF.
When S switches OFF, R switches OFF