Timing Code Made Easy?

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MGE

Any pitfalls to using this code? I found it in the awesome "Annihilation" game source code. When I did some sprite tests, the animation was a little more jittery compared to my delta logic, but for someone who wants a fixed logic framework, this might be ideal.

Const	ReqFPS:Int=60  ' how often to update logic
Global	SUperiod:Int=1000/ReqFPS
Global	SUtime:Int=MilliSecs()-SUperiod
Global	SUelapsed:Int
Global	SU:Int
Global	SUticks:Int
'
Repeat
	Repeat
		SUelapsed=MilliSecs()-SUtime
	Until SUelapsed

	SUticks=SUelapsed/SUperiod
	If SUticks>1000 Then SUticks=1
	For SU=1 To SUticks
		SUtime=SUtime+SUperiod
		UpdateLogic()
	Next
	Cls
	RenderAll()
	FPS()
	DoDebug()

	Flip(0)
Until QUIT=1