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Like this?
ReverseByte:
   jz   RevByteX1
   movc a,@a+pc
RevByteX1:
   ret
   db   80h,40h,0C0h,20h,0A0h,60h
... etc.

nope

but like this
ReverseByte:
   inc a
   movc a,@a+pc
   ret
   db   0,80h,40h,0C0h,20h,0A0h,60h,......

(the code is in "the bible" chapter 2 pg 41).

This is a bit "cleaner" although yours will work.
I would set up the table in 126 per line and with your appeoach it woyld be a bit less starightforward to figure out what to put there.

A suggestion: after having built the table, use one of the coded routines to verify your table.

Erik