Yes, there are 16KB of RAM. If you do not use RAM for any other purposes at all, you my use a 16KB sw buffer. But c compiler will not allow you to do that. It has to allocate RAM for stack, static variables, etc. If you are not using much of those, you can probably have enough RAM left for 15KB sw buffer. But if you use library functions and include other code, you may end up not having enough RAM for them. The compiler/debugger has its own problems too. It is not the patron saint of programmers, it may give you troubles with or without warnings with or without a justifiable reason.
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