Suspend screen management
void SLsmg_suspend_smg (void)
SLsmg_suspend_smg can be used to suspend the state of the
screen management facility during suspension of the program. Use of
this function will reset the display back to its default state. The
funtion SLsmg_resume_smg should be called after suspension.
This function is similar to SLsmg_reset_smg except that the
state of the display prior to calling SLsmg_suspend_smg is saved.
SLsmg_resume_smg, SLsmg_reset_smg