constant placement

How a "HEX burner" program writes each section of the hex file xconst,idata etc.. to a IC ?

First of all, it's not a HEX burner, it's just a burner. And classically it'll be not a program, but a piece of dedicated hardware controlled by a program. Some modern devices can get away with just a program, but not all.

Second, idata is never burnt into anything. Special constant xdata segments may, but only with rather unusual hardware that allows you to do this. This is not something you typically do --- it's more like an ultima ratio solution for rather desperate cases.

Given the lack of insight and experience you've displayed here so far, I'm almost 100% certain that you're not in such a situation justifying its application. So forget about it for now.

You appear to have lots of basic training to complete yet before you tackle stuff like this --- so do that, now, before you worry about where to sell the skin of that bear you haven't even found, much less killed yet.

How a "HEX burner" program writes each section of the hex file xconst,idata etc.. to a IC ?

First of all, it's not a HEX burner, it's just a burner. And classically it'll be not a program, but a piece of dedicated hardware controlled by a program. Some modern devices can get away with just a program, but not all.

Second, idata is never burnt into anything. Special constant xdata segments may, but only with rather unusual hardware that allows you to do this. This is not something you typically do --- it's more like an ultima ratio solution for rather desperate cases.

Given the lack of insight and experience you've displayed here so far, I'm almost 100% certain that you're not in such a situation justifying its application. So forget about it for now.

You appear to have lots of basic training to complete yet before you tackle stuff like this --- so do that, now, before you worry about where to sell the skin of that bear you haven't even found, much less killed yet.