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Address Latch Enable:-
Address Latch was Intel's way of limiting the number of pins on their early microprocessors, to limit the production cost.
Sadly this "feature" remained in Intel processor architecture for several generations, despite the fact that production cost was no longer an issue.
What it does: On the early processors there was an 8 bit bus acting both as an address and a data bus (to save pins). Then there was the ALE (Address Latch Enable) pin, that determined if the bus should act as data or address bus. This of course decreased the efficiency of the processor, because you had to switch back and forth between the two states, according to which bus was needed.
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What is full form of ale?
address latch enable
What does the ALE signals represent?
ALE signals means 'address latch enable' .If its value is 1,it enable the latch but doesn't store. and when its value is 0 it store the contents of latch.
A positive going pulse which is always generated when 8085 MPU begins the machine cycle?
ALE Address Latch Enable
What are the control signals for 8051 micro controller?
EA - External Access PSEN - Program store Enable ALE - Address Latch Enable RST - Reset WR - RD
What is address latching?
Address Latch Enable:- Address Latch was Intel's way of limiting the number of pins on their early microprocessors, to limit the production cost. Sadly this "feature" remained in Intel processor architecture for several generations, despite the fact that production cost was no longer an issue. What it does: On the early processors there was an 8 bit bus acting both as an address and a data bus (to save pins). Then there was the ALE (Address Latch Enable) pin, that determined if the bus should act as data or address bus. This of course decreased the efficiency of the processor, because you had to switch back and forth between the two states, according to which bus was needed.
What is command latch enable?
you mut use ase
What is ALE in 8086 in microprocessor?
ALE is a signal that means that the data bus contains the lower order address bus values. External hardware should strobe the data bus during ALE time, and lock it on the falling edge of ALE.
What is function of ALE signal?
ALE, or Address Latch Enable, tells hardware logic that the data on the data bus represents address information that should be latched. This is a technique used called multiplexing, and it allows for the pin count on the processor chip to be reduced.
What is a transparent latch in a microprocessor?
A transparent latch (or simply a latch) is a digital logic device that can store two stable states with a level sensitive control signal called enable/latch, when this control signal is in the enable state the latch device transparently passes its input signal to its output, when this control signal is in the latch state the latch device holds its output in the current state and ignores the input signal. This behavior is different from flip flops (e.g. D flip flop), which are usually clocked and often edge sensitive not level sensitive.
Draw a schemetic to demultiplex bus ad0-ad7 using any octal latch in 8085 microprocessor?
The 8085 microprocessor is used IC 74LS373 to latch the address of 8085. Basically latch is consists of 8 flip flops. Generally we used D-flip flops (Delay).The clock of these flip flops are connected together and available as a output pin called enable.Working : The address will appear on AD0 AD7 lines. The ALE will go high and forcingEnable = 1. This will make latch enable and ready to work. Before address disappears ALE = 0. This will make latch disable. AD0 - AD7 will now be used as data bus.Hence, AD0 - AD7 (low order) address bus of the 8085 microprocessor is multiplexed (time-shared) with the data bus. The buses need to be demultiplexed.
Design a divide by two counter using D-Latch?
Hi, divide by two counter using d latch design is just same like as Divide by two counter using d ff. ex: we have a d latch, if enable is high, what ever the input , that will capture the output. if enable is low, This condition latch will remain in same state. So, if u do like, u can achieve divided by 2 counter using d latch. i hope this will help u.
What is the need of ale signal in 8085?
The ALE signal on the 8085 is Address Latch Enable. When ALE is true, the data bus contains the low order address information for the current bus cycle. External hardware, i.e. latches, are expected to follow the data bus when ALE is true. At the point where ALE goes false, at approximately the rising edge of CLK, the latches are expected to latch and hold the data bus, presenting it to the outside world as the low order address bus.
