Bit field

[Aswin_5232]

Hi,

I am using MC9S12DG256 controller and IDE is CodeWarrior 5.2. When I am disabling the option bit field size reduction , the memory allocation starts from mid instead of start. for example my variable is of type int it starts from 8 instead of 0. I want to start from 0. Please find the screen shot attached.

[lama]

Hi,

the game you are playing is related to the defined sizes of bitfield elements (unsigned char, unsigned int) and then MSB. LSB order, MSb, LSb order. I suggest you to test combinations simply with different options after reading the help ....

lama_0-1776099462232.png

If you want more info about bitfields I suggest to go through all appearnces in

lama_2-1776099768901.png

Plus when you select an item it can show more options with the same name. Open each of them because each of them direct to different contet.

lama_3-1776099895547.png

... or go to your instalation dir c:\Program Files (x86)\Freescale\CWS12v5.2\Help\pdf\

open file Compiler_HC12.pdf

and search for each existence of bitfield keyword.

Best regards,

Ladislav