What is the difference between #byte and #locate?

[matrixofdynamism]

Both seem to be doing the same thing, so what is the difference between them since if these are 2 separate preprocessor directives, there must be things unique about them,

[Ttelmah]

For 99.9% of things you can use either.
The reason for both is basically 'historic'. Most compilers have a #locate. CCS originally had a #byte that would automatically create a byte sized variable. Then #byte was extended to allow other things to be located by it, and #locate was was extended to also automatically create a byte sized variable if it was called without an existing variable.
Result, both functions function basically the same.

I tend to use them 'as originally intended', so use #byte to only create byte sized variables at specific locations, #word to create int16 variables at specific locations, and #locate to locate anything else. This way the declaration contains a 'hint' to what you are actually doing.
However the need for these has declined sharply in recent years, so #byte for the odd processor register is about the only need that really exists.

[matrixofdynamism]

When you say that the useage has declined, does it mean it has declined specifically in CCS PIC C compiler? Why is that so?

[Ttelmah]

Because now you can access 99.9% of all chip features, without ever having to go DIY.
Just about every setting possible in the chips is available through the CCS functions.

Back when I first wrote CCS code, 80% of code would at some point involve a direct access of some sort. Ten years ago, perhaps 10% of code would at some point involve going direct. On the last dozen programs I have done, I haven't had to go direct even once.

[E_Blue]

#LOCATE define an address for exclusive use; #byte the address can be shared.
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Electric Blue

[Ttelmah]

I know it says that, but try it. You can #locate multiple values at the same location, and it won't complain....

[E_Blue]

Maybe have not that foolprof protection.
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Electric Blue