Please solve the following: 1. How many byte-sized memory references in total do
ID: 3561726 • Letter: P
Question
Please solve the following:
1. How many byte-sized memory references in total do the following instructions require for complete execution? Ali opcodes are single byte. What type of addressing is used? LDD #$82f Number of byte-sized memory references? What type of addressing is used? $279F LDAA Number of byte-sized memory references? What type of addressing is used? #80 LDAB Number of byte-sized memory references? What type of addressing is used? $5f2 LDD Number of byte-sized memory references? What type of addressing is used?Explanation / Answer
Answer 1 :
LDD #$82f
NUMBER OF BYTE SIZED MEMORY REFERENCES: 3
ADDRESSING MODE:IMMEDIATE
LDAA $279F
NUMBER OF BYTE SIZED MEMORY REFERENCES:3
ADDRESSING MODE: EXTENDED
LDAB #80
NUMBER OF BYTE SIZED MEMORY REFERENCES: 2
ADDRESSING MODE: IMMEDIATE
LDD $5f2
NUMBER OF BYTE SIZED MEMORY REFERENCES:3
ADDRESSING MODE: EXTENDED
Answer 2:
OPCODE OPERAND
86 LDAA #CB
CB
FC LDD $0396
03
96
CC LDD #0086
00
86
B6 LDAA $4325
43
25
Answer 3:
MACHINE CODE
LDAA $24 B6 24
LDD $32 DC 32
LDD #$80 CC 80
LDD #$8430 CC 84 30
LDD $820 FC 08 20