If you could assign function to the *reserved A5 instruction in the 8051, what would it be? My vote: Choice 1, movx dptr,@dptr+a Choise 2, dec dptr *From what I recall, this instruction is reserved for the interrupt mechanism, which (upon an interrupt) crams this instruction into the decoder as a special jump-to-vector command. Thus, its likely we'll never see any variant actually using the A5 instruction, but its fun to wish just the same.
I've just checked the datasheet, and the Triscend E5 devices use the 0xA5 instruction as a Software Breakpoint