what does latching mean exactly

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Manavdeep Singh

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can somebody tell me what does it mean when we say "a write to the pin would be latched"
 

a write to the pin means read the pin of input port.
 

Hi Manavdeep Singh,

Please make your questions a little bit elaborate, specify the development environment like language, processor type and so on.
 

Usually, it means that the pin has a flip-flop (a data latch) behind it. When data is written to it, the flip-flop holds the data even after the write process has ended. The only way to change the state of the pin is to write the opposite data state to it or in some case, to tri-state it.

In comparison, an un-latched pin would carry the entire internal data bus to it 'live' (and constantly changing) and a latch pulse would be provided to allow external circuits to 'snapshot' it only when it has the required data on it.

Brian.
 
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