AVR-Chat

Dave,

> Speed contest: Fast code desired, space is no object.
> Task: Make UP look like Down by rotating all the bits in a byte.
> Input in TEMP, output in TEMP2 or for bonus points, in TEMP, such that

you want quick? and space isn't a problem?
use a Look Up Table, and use LPM
simply copy the value from the TEMP register to R30, dump the table location 
into R31 (and Left shift it, or just keep a value thats correct to avoid 
this step) and the move r0 to Temp2

.EQU    TABLE_LOC =$02


REVERSE:
    LDI        R31,TABLE_LOC
    MOV    R30,TEMP
    LPM
    MOV    TEMP2,R0


.ORG    $0100
REVERSE_TABLE:
.db 0xFF,0xFE,0xFD, etc, etc, etc


not sure the code is 100% correct, but you get the idea.

Paul