8085 Questions

1) How many T-states does the following instruction take?

a) XRA reg

b) XRA mem

2) Which of the following instruction are 3-byte,2-byte and 1-byte.indicate.

a) ADD B

b) MOV A,B

c) LDA mem

d) MVI B,F2H

e) JMP mem

3) How many general purpose register does 8085 programming model have?

4) Why did 8085 processors have higher power/transistor dissipation than 8086 processors?(answer in one word)

5) How many operation codes and instruction does 8085 processor have?

6) How many hardware interrupts does 8085 have? Which has the highest and

lowest priority?

7) What will PCHL instruction do? How many T-states does it have?

8) A 8085 micro-processor system have one 2K ROM and one 2K RAM chip? Suggest the starting address of these chips?

9) Calculate the time required to execute the following code segment when CPU is connected o a crystal of 2 Mhz.

MVI D,04H

BACK:DCR D

JNZ BACK

10) Reg H=00H

Reg L=01H

Give the output of DCX H with the values of flag?

11) Give the addressing modes of the following instructions?

a) CMA

b) LDAX B

c) MOV M,A

12) Call a subroutine without using CALL instruction? Write the code fragment?