19. In Immediate Addressing Mode, the second byte (source operand) of the instru

Question

19. In Immediate Addressing Mode, the second byte (source operand) of the instruction is a(n) a. opcode c. immediate data value b. label d. N/A 20. The CPU of the 8051 cannot ignore which interrupt? a. Serial c. Reset b. Timer d. N/A 21. In the 8051, which addressing mode is used for pushing onto the stack? Immediate Addressing Mode Relative Addressing Mode a. c. b. Register Addressing Mode d. Direct Addressing Mode 22. Which register is -128 to +127 bytes from its target address (relative address)? a. Data Pointer c. TMOD Register b. Accumulator d. Program Counter

Explanation / Answer

19.

Correct option: c. immediate data value

Explanation: In immediate addressing mode, the first operand is a register or memory location, and the second operand is an immediate constant.

20.

Correct option: c. Reset

Explanation: Reset is a non-maskable interrupt; so it cannot be ignored.

21.

Correct option: d. Direct Addressing Mode

Explanation: Only Direct Addressing Mode is allowed for push and pop instruction of the stack.

22.

Correct option: d. Program Counter

Explanation: The relative address ranging from -128 to +127 bytes of memory is relative to the address of the current PC (program counter), hence the correct answer is Program Counter.

/*Hope this helps. Thanks*/

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