Technical Questions

Q:

What are software interrupts?

Answer

RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7.

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Q:

Which interrupts has the highest priority?

Answer

TRAP has the highest priority


there are 2 types of interrupts external and internal. NMI has highest priority among all external interrupts, TRAP has highest priority among all internal interrupts. 

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Q:

Name 5 different addressing modes?

Answer

Immediate, Direct, Register, Register indirect, Implied addressing modes.

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Q:

How many interrupts are there in 8085?

Answer

There are 12 interrupts in 8085.

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Q:

what is the clock frequency for 8085?

Answer

3MHz is the maximum clock frequency for 8085.

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Q:

What is the RST for the TRAP?

Answer

RST 4.5 is called as TRAP.

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Q:

Can RC circuit be used as clock source for 8085?

Answer

Yes, it can be used, if an accurate clock frequency  is not required. also the component cost is low compared to LC or Crystal.

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Q:

Why address bus in unidirectional and data bus is bidirectional?

Answer

Because there is no need address traansaction between processor and peripheral device but data bus is needed because data has to be read and write

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