Addressing Modes Multiple Questions and Answers.




11.A basic instruction that can be interpreted by a computer generally has
A. An operand and an address
B. A decoder and an accumulator
C. Sequence register and decoder
D. None of these

12.In a microprocessor system with memory mapped I/O
A. Devices have 8-bit addresses
B. Devices are accessed using IN and OUT instructions
C. There can be a maximum of 256 input devices and 256 output devices
D. Arithmetic and logic operations can be directly performed with the I/O data.

13.The addressing mode used in an instruction of the form ADD X, Y, is
A. absolute
B. immediate
C. indirect
D. Relative

14.The ability to temporarily halt the CPU and use this time to send information on buses is called
A. Direct memory access
B. Vectoring the interrupt
C. System Interrupt
D. Cycle stealing

15. Number of machine cycles required for RET instruction in 8085 microprocessor is
A. 1
B. 2
C. 3
D. 4

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