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Consider the 8085 instruction IN 09H stored as follows:
Add the following incomplete timing diagram for the instruction :
(a) Write the contents of the boxes, A, B, C and D in hexademcimal in your answer sheet do not draw any pictures.
(b) Write the state of both ALE and RD pins at times T1, T2, T3 and T4. (c) How do you generate the signal that tells the peripheral to put the data on the bus? Answer by completing the following statement in your answer book : By combining signals ..............
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- T1 = 1 , T2 = T3 = 0 , T4 = 1
- C : 0 9 H D : 5 1 H
- 1 , T1 = 1 , RD signal
- None of the above
Correct Option: D
(a) A : D A H B : 0 9 H
C : 0 9 H D : 5 1 H
(b) ALE : T1 = 1
T2 = T3 = T4 = 0
RD : T1 = 1
T2 = T3 = 0. T4 = 1
(c) The IO/ M signal and RD signal
