Database-MySQL [Hexaware Placement]: Sample Questions 1 - 1 of 1

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Question 1


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What is ALE?


ALE (Address Latch Enable) is a control signal of 8085 MPU. 8085 is a 8-bit microprocessor which have 16-bit address bus among them lower 8-bit are multiplexed. So while MPU executes read or write operation it needs to demultiplex. ALE control signal used to demultiplex the lower order address and data bus. The address bus will be enabled during the 1st clock cycle as the ALE pin goes high i.e.. logic ‘1’ during the first half cycle. During 2nd and 3rd clock cycles it goes low i.e.. logic ‘0’ indicating the address & data bus (AD0-AD7) is for data. Hence it disables the address & data bus during the 2nd and 3rd clock cycles.

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