Question

Please answer the questions correctly ASAP. It's multiple choice.

1)

2)

Which of the following values of the Condition Code (N Z P) could occur in the LC-3 to indicate that the value written to the register file is less than or equal to zero? [You must check all that apply to get credit.] 000 001 011 100 101 110 111

3)

Answer 1

the to check for equality or inequality a subtraction operation is performed.

if answer is 0 the numbers are equals

if negative answer then number A < B

if number is positive > 0 the A> B

answer 1:

in order to check for less than equals to condition

less than condition has to be true hence N==1

and also an equality condition has to be true Z==1

hence both flags can be ON for less than equals to

hence

100

010

110

ARE THE THREE valid conditional codes

answer 2:

now the conditional codes can only be changes by the ALU arithmetic instructions

hence

ADD,AND, LEA , LD are the instruction present here that can affect the NZP flags

answer 3:

since the conditional codes match to the condition true for branching hence Pc= PC+PCofset

1000+0007=1007