Question

Question #1 Convert the following assembly program into machine code. LDAA #$A ! STAA $1000 INCA LDAB $1000 DECB ABA Here: Bra Here Question # 2 (a) In Question # 1 , determine the values of PC, A, B, N, Z, V, C after each instruction (b) Verify your answers by using Code Warrior pleaseanswernumberz

Answer 1

Answer :- The value of flag bits and registers have been written below. The numbering is the instruction number.

Register and flag values
1. A = 0xA1, N = 0, Z = 0, C = no effect, V = 0, B = no change
2. A = 0xA1, N = 0, Z = 0, C = no effect, V = 0, B = no change
3. A = 0xA2, N = 0, Z = 0, C = no effect, V = 0, B = no change
4. A = 0xA2, N = 0, Z = 0, C = no effect, V = 0, B = value from memory $1000 = $A1.
5. A = 0xA2, N = 0, Z = 0, C = no effect, V = 0, B = $A1 - $01 = $A0.
6. A = 0xA1 + B = $41, N = 0, Z = 0, C = 1, V = 0, B = $A0.
7. A = 0x41, N = 0, Z = 0, C = no effect, V = 0, B = $A0.
8. No flags chaged. Register values are unaffected.