Nvis 5586A
Nvis Technologies Pvt. Ltd.
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Q39. How clock signal is generated in 8086? What is the maximum internal clock
frequency of 8086?
Ans.
The 8086 does not have on-chip clock generation circuit. Hence the clock generator
chip, 8284 is connected to the CLK pin of 8086. The clock signal supplied by 8284 is
divided by three for internal use. The maximum internal clock frequency of 8086 is
5MHz.
Q40. Write the special functions carried by the general purpose registers of 8086.
Ans.
The special functions carried by the registers of 8086 are the following.
Register Special function
1. AX 16-bit Accumulator
2. AL 8-bit Accumulator
3. BX Base Register
4. CX Count Register
5. DX .Data Register
Q41. What is pipelined architecture?
Ans.
In pipelined architecture the processor will have number of functional units and the
execution time of functional units is overlapped. Each functional unit works
independently most of the time.
Q42. What are the functional units available in 8086 architecture?
Ans.
The bus interface unit and execution unit are the two functional units available in
8086 architecture.
Q43. List the segment registers of 8086.
Ans.
The segment registers of 8086 are Code segment, Data segment, Stack segment and
Extra segment registers.
Q44. What is masking and why it is required?
Ans.
Masking is preventing the interrupt from disturbing the current program execution.
When the processor is performing an important job (process) and if the process should
not be interrupted then all the interrupts should be masked or disabled. In processor with
multiple 'interrupts, the lower priority interrupt can be masked so as to prevent it from
interrupting, the execution of interrupt service routine of higher priority interrupt.
Q45. What is a flag?
Ans.
Flag is a flip flop used to store the information about the status of the processor and
the status of the instruction executed most recently.
Q46. What is ALE?
Ans.
The ALE (Address Latch Enable) is a signal used to demultiplex the address and
data lines, using an external latch. It is used to enable the external latch.
Summary of Contents for 5586A
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