rob it will work for sure, but this will possibly translated to machine code equalant to following assembly code.


when ever you write 'byte << x'
its can translated to either

mov a,byte
rlc a
rlc a
rlc a
x times

or

mov <some register>,x
mov a,byte
rlc a
djnz <some register>,$-1

because 51 is capable of shifting single bit at a time not as an x86 where

mov al,byte
mov cl,x
shl al,cl

will do the job.

this method works where time is in plenty, but inside a ISR or faster speed requirment always better to use mask. or the single move will do as 51 itself capable of processing single bit


abhishek