Should I use char for a signed int in C?

If the integer value I want to store is only requiring 1 signed byte, should I use a char or a short for the variable type?

If the program was for a limited hardware system, I would obviously want to use a char for memory efficiency, but should I favour the potentially more readable short if the program is for a system with negligible effect? Or would it be considered common knowledge enough that a char represents a signed byte?

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