How to limit digit After comma in Data Register

Why would you need to do that?

For some simple use you can do this in BG using GO and some registers:

   1:  R[22:Temp]=R[21:Input]*10    ;
   2:  GO[10]=(R[22:Temp]) ;
   3:   ;
   4:  R[23:Output]=(GO[10]/10) ;

No good idea, to do it in BG this way.

BG runs asynchronous, so in some cases if register is rewritten by another one than BG, it's possible that BG overwrites the new value.