FLAT8000_P30 memory

[michaelsarafidi]

hi there,

We are using HC12DG256  and Codewarrior 3.1. These days we are evaluating Codewarior 5.1.

We have opened our project with CW 5.1 built it and run it successfully.

What i want to ask is what is FLAT8000_P30 or flash window (memory from 0x8000 to 0xBFFF).

At CW3.1 this area was empty (0xFF), at CW5.1 is full.

Thanks in advance.

[RadekS · Accepted solution]

At address 0x8000 to 0xBFFF is flash memory window.

S12DG256 is 16bit MCU, therefore we can directly address only 64kB memory range (0x0000~0xFFFF).

S12DG256 contain 256kB flash, this flash is divided to sixteen 16kB pages (page 30~3F). We can access whole flash trough memory window. At address 0x8000 to 0xBFFF is visible page content according PPAGE register settings. Two pages (3E, 3F) are accessible directly (0x4000~0x7FFF, 0xC000~0xFFFF) and we call them as non-banked.

Default placement for your code is paged flash (banked). Therefore you see your code at page 30.

For details, please check your project *.prm file. Placement of your code you can drive by #pragma commands (for example):

#pragma CODE_SEG NON_BANKED

//your code

#pragma CODE_SEG DEFAULT

[GordonD]

Michael,

Where are you seeing the text "FLAT8000_P30" in the .map file? In the .prm file?

Regards,

Gordon