Help with a chunk of assembly code

Hello, i'm trying to disassemble some code from assembly.

Code:

---

mov  eax, [rbp+INT_A]
cdqe
movzx edx, [rbp+CHAR_AB]
mov  [rbp+rax+char_90], dl

---

I believe CDQE is convert Dword into Qword so something like int A = *AB assuming AB is a pointer.
I don't know how the last statement fits into the code.
i think dl also comes up when i set char_90 = function or some other code.

It seems to me that it's taking a 32-bit value from the stack and converts it to 64-bit, take another 8-bit value from the stack and converts it to 32-bit (or is it 16-bit, can't remember which is the default). Then it uses the first number as offset to a byte array (which is on the stack too) in which it places the first byte of the second number...

In other words:

Code:

---

{
    int INT_A;
    char CHAR_AB;
    char char_90[90];

    char_90[INT_A] = CHAR_AB;
}

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