1. The second byte of an instruction in the immediate addressing mode is A a lab
ID: 3726182 • Letter: 1
Question
1. The second byte of an instruction in the immediate addressing mode is A a label B. an opcode C. an address value D. a data value 2. The addressing mode for the instruction ADD A, R7 is the A. indexed addressing mode B. immediate addressing mode C. relative addressing mode D register addressing mode 3. Which addressing mode is used for pushing information onto the stack? A. Direct addressing mode B. Indexed addressing mode C. Relative addressing mode D. Register addressing mode 4. What is the final result in the accumulator after the execution of the following program segment? MOV A, #13H ADD A, #17H ADD A, # 10H A. 1BH B. 40H C. 28H D. 3AH 5. A microcontroller's program counter is typically as wide as the A. data bus B. control bus C. largest bus width D. address bus 6. Which of the following instructions is used to access data elements of lookup table entries the program ROM space of the 8051? A. MOV @RO, A B. MOV @A, @R1 C. MOV A, @A+DPTR D. MOVC A, @A+DPTRExplanation / Answer
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We are required to do only 4 parts of a question.
1. The first byte in immediate address mode is for opcode and second byte is for data value. Hence the correct option is d. A data value
2. R7 is a register and hence the addressing mode used is register mode. Hence the correct option is a. Register addressing mode.
3. For pushing information onto a stack we use register addressing mode. Hence the correct option is d. Register addressing mode.
4. First we move 13h to the A register, the we add 17h to A. Now we have 13h + 17h = 2Ah. Then we again add 10h to A. Now we have 2Ah + 10h = 3Ah. Hence the correct option is d. 3Ah
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