https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Bit-field/m-p/2350267#M20882 <P>Hi,</P> <P>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 ....<BR /><BR /></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="lama_0-1776099462232.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/382159i86F640708F1B8C89/image-size/medium?v=v2&amp;px=400" role="button" title="lama_0-1776099462232.png" alt="lama_0-1776099462232.png" /></span></P> <P>If you want more info about bitfields I suggest to go through all appearnces in</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="lama_2-1776099768901.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/382161i7E57DEE5BE534351/image-size/medium?v=v2&amp;px=400" role="button" title="lama_2-1776099768901.png" alt="lama_2-1776099768901.png" /></span></P> <P>&nbsp;</P> <P>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.<BR /><BR /></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="lama_3-1776099895547.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/382162i8797026D7CA324FC/image-size/medium?v=v2&amp;px=400" role="button" title="lama_3-1776099895547.png" alt="lama_3-1776099895547.png" /></span></P> <P>&nbsp;</P> <P>... or go to your instalation dir&nbsp;c:\Program Files (x86)\Freescale\CWS12v5.2\Help\pdf\</P> <P>open file&nbsp;Compiler_HC12.pdf</P> <P>and search for each existence of bitfield keyword.</P> <P>&nbsp;</P> <P>Best regards,</P> <P>Ladislav</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P><BR /><BR /><BR /></P> Mon, 13 Apr 2026 17:09:42 GMT lama 2026-04-13T17:09:42Z https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Bit-field/m-p/2349912#M20880 <P>Hi,</P><P>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.</P> Mon, 13 Apr 2026 06:36:44 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Bit-field/m-p/2349912#M20880 Aswin_5232 2026-04-13T06:36:44Z https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Bit-field/m-p/2350267#M20882 <P>Hi,</P> <P>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 ....<BR /><BR /></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="lama_0-1776099462232.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/382159i86F640708F1B8C89/image-size/medium?v=v2&amp;px=400" role="button" title="lama_0-1776099462232.png" alt="lama_0-1776099462232.png" /></span></P> <P>If you want more info about bitfields I suggest to go through all appearnces in</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="lama_2-1776099768901.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/382161i7E57DEE5BE534351/image-size/medium?v=v2&amp;px=400" role="button" title="lama_2-1776099768901.png" alt="lama_2-1776099768901.png" /></span></P> <P>&nbsp;</P> <P>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.<BR /><BR /></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="lama_3-1776099895547.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/382162i8797026D7CA324FC/image-size/medium?v=v2&amp;px=400" role="button" title="lama_3-1776099895547.png" alt="lama_3-1776099895547.png" /></span></P> <P>&nbsp;</P> <P>... or go to your instalation dir&nbsp;c:\Program Files (x86)\Freescale\CWS12v5.2\Help\pdf\</P> <P>open file&nbsp;Compiler_HC12.pdf</P> <P>and search for each existence of bitfield keyword.</P> <P>&nbsp;</P> <P>Best regards,</P> <P>Ladislav</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P><BR /><BR /><BR /></P> Mon, 13 Apr 2026 17:09:42 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Bit-field/m-p/2350267#M20882 lama 2026-04-13T17:09:42Z