Question

In: Computer Science

Hand assemble the following unconditional BRA instruction: HERE BRA HERE. Remember to show your work including...

Hand assemble the following unconditional BRA instruction: HERE BRA HERE. Remember to show your work including the branch calculation. (Motorolla 68k)

Solutions

Expert Solution

Greetings!!

BRA instruction is an unconditional branch instruction which stands for Branch Always.

HERE BRA HERE instruction is equivalent to NOP since it loops on the same label itself.

Assume that a given set of instructions are givenL

  

         ORG $2000

         LDAB #5

         ABA

         STAA $0000

         LDAA #2

         STAA $0001

HERE BRA HERE

After loading to memory it looks like:

ORG $2000

$2000                         LDAB #5

$2002                         ABA

$2003                         STAA $0000

$2005                         LDAA #2

$2007                         STAA $0001

$2009    HERE BRA HERE

Opcode for this instruction is 20 and it loops to PC+offset and in this case, PC is 200B at the time of executing this instruction and hence to loop back to the address 2009, the offset should be -2 and which is represented as FE. Hence the machine code of this instruction would be 20 FE.

Hope this helps


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