MCQ2

Address latch enable pin is used to

• multiplex address and data lines

• demultiplex address and data lines

• interrupt microprocessor

• serial communication

CMP does

• internal subtraction

• internal addition

• multiplication

• division

If a microprocessor uses a 5 MHz oscillator, then duration of one T state is

• 1 μs

• 0.333 μs

• 0.2 μs

• 2 μs

The processor status word of 8085 microprocessor has five flags namely:

• S, Z, AC, P, CY

• S, OV, AC, P, CY

• S, Z, OV, P, CY

• S, Z, AC, P, OV

What type of instructions can potentially change the sequence of operations in a program?

• Logical instructions

• Data transfer instructions

• Branch instructions

• Arithmetic instructions

Which is the first machine cycle of an instruction?

• An op-code fetch cycle

• A memory read cycle

• A memory write cycle

• An I/O read cycle

• immediate addressing mode

• Direct addressing mode

• Register indirect addressing mode

• Register addressing mode

The register which holds the information about the nature of results of arithmetic and logic operations is called as

• Accumulator

• Condition code register

• Flag register

• Process status register

The issue of interfacing a fast processor and slow memory is resolved by

• using the ready input signal

• using an external memory

• using a coprocessor

• none of these

Which of the following is a 16-bit register for 8085 microprocessor?

• Stack pointer

• Accumulator

• Register B

• Register C