Memory address organization for CC2541

Hi.

I'm trying to use inner flash memory of CC2541.

So I used HalFlashRead/Write/Erase function with IAR Workbench.

However, because of the declaration of address, sometimes IDATA overflow shows up.

Is there any information about memory address?

In the manual, it says the flash memory consists of up to 128 pages of 2048 bytes.

I thought each page has 16 bytes since (2048/128 = 16).

How many bytes per one page?

And how can I declare address properly?