Bit-reverse a byte on 68HC12

Question

I\'m in a microprocessors class and we are using assembly language in Freescale CodeWarrior to program a 68HCS12 micro controller. Our assignment this week is to revers a by

Answer 1

When you do a right shift, what was the least significant bit goes into the carry flag.

When you do a rotate, the carry flag is used to fill in the vacated bit of the result (LSB for a ROL, MSB for a ROR).