Computer Knowledge

Digital Logic and Microprocessors

735 Questions

Digital logic and microprocessors form the core of computer science, covering logic gates, combinational and sequential circuits, and CPU architecture. These topics are crucial for computer knowledge sections in technical exams. Test your digital electronics basics here.

Logic gates and circuitsCombinational vs sequential circuitsMicroprocessor instructionsTruth tables and boolean functions

Digital Logic and Microprocessors Questions

Multiple choice

Which instructions perform inclusive Or's between the specified byte, either in a register or in the address contained in the H&L registers and the contents of the accumulator in 8085 processor?

  1. OR Instructions

  2. MVI Group

  3. ADD Instructions

  4. Ex-OR Instructions

  5. LXI Instruction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

These instructions perform inclusive OR's between the specified byte, either in a register or in the address contained in the H&L registers and the contents of the accumulator in 8085 processor.

Multiple choice

Which instructions perform Exclusive Or's functions between a specified byte, either in a register or in a byte contained in the address in the H&L registers, and the contents of the accumulator in 8085 processor?

  1. ADD Instruction

  2. Ex-OR Instructions

  3. OR Instructions

  4. AND Instructions

  5. LXI Instruction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

These instructions perform Exclusive Or's functions between a specified byte, either in a register or in a byte contained in the address in the H&L registers, and the contents of the accumulator in 8085 processor.

Multiple choice

In which of the following circuits, the mode control may control the direction of shifting in some real devices and the data will be shifted one bit position for each clock pulse?

  1. Serial-in, Parallel-out Shift Register

  2. Ring Counter

  3. Synchronous Counter

  4. Parralel-in, Parallel-out Shift Register

  5. Latch
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The mode control may control the direction of shifting in some real devices and the data will be shifted one bit position for each clock pulse.

Multiple choice

Which instruction permits the system to examine the interrupt mask by loading into the A register a byte which defines the condition of the mask bits for the maskable interrupts in 8085 processor?

  1. Interrupt Mask Bits D0, D1, D2

  2. Interrupt Enable Bit D3

  3. Read Interrupt Mask

  4. Trap

  5. X1 & X2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This instruction permits the system to examine the interrupt mask by loading into the A register a byte which defines the condition of the mask bits for the maskable interrupts in 8085 processor.

Multiple choice

In which of the following circuits, the high-to-low transition of the comparators's output will cause the shift register to load whatever binary count is being output by the counter, thus updating the ADC circuit's output?

  1. Staircase Ramp ADC

  2. Single-slope Integrating ADC

  3. Dual Slope Integrator ADC

  4. Flash Type ADC

  5. Resolution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The high-to-low transition of the comparator's output will cause the shift register to load whatever binary count is being output by the counter, thus updating the ADC circuit's output.