Addressing Modes of MCS-51 - MCQs with Answers

Addressing Modes of MCS-51 - MCQs with Answers


Q1. Which bits of opcode specify the type of registers to be used in the register addressing mode?

a. LSB
b. MSB
c. both a & b
d. none of the above

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ANSWER: a. LSB



Q2. Which base-register is preferred for address calculation of a byte that is to be accessed from program memory by base-register plus register-indirect addressing mode?

a. DPTR
b. PSW
c. PCON
d. All of the above

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ANSWER: a. DPTR



Q3. What does the symbol '#' represent in the instruction MOV A, #55H ?

a. Direct datatype
b. Indirect datatype
c. Immediate datatype
d. Indexed datatype

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ANSWER: c. Immediate datatype


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