topic Re: MC51QE128 RAM Function alignment in ColdFire/68K Microcontrollers and Processors https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MC51QE128-RAM-Function-alignment/m-p/159999#M4987 <HTML><HEAD></HEAD><BODY><P>I know that the 68K processors (from which the ColdFire is derived) required 16-bit alignment on the code. ColdFire has variable-length instructions, but they might require that a function start on an even address. I would check the reference manual for your particular processor as to alignment restrictions on the code.</P><P>&nbsp;</P><P>---Tom</P></BODY></HTML> Wed, 17 Aug 2011 23:59:11 GMT J2MEJediMaster 2011-08-17T23:59:11Z MC51QE128 RAM Function alignment https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MC51QE128-RAM-Function-alignment/m-p/159998#M4986 <HTML><HEAD></HEAD><BODY><P>I debugged an issue related to a RAM function failing after seemingly unrelated changes caused the starting address of a block of RAM used to hold a function to shift. When the block was aligned to even bytes the function executed flawlessly, but starting at an odd location caused Illegal Address (or Illegal Opcode, I don't remember) resets. My question is why does 16-bit alignment work?</P></BODY></HTML> Wed, 17 Aug 2011 23:01:10 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MC51QE128-RAM-Function-alignment/m-p/159998#M4986 JaseMachine 2011-08-17T23:01:10Z Re: MC51QE128 RAM Function alignment https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MC51QE128-RAM-Function-alignment/m-p/159999#M4987 <HTML><HEAD></HEAD><BODY><P>I know that the 68K processors (from which the ColdFire is derived) required 16-bit alignment on the code. ColdFire has variable-length instructions, but they might require that a function start on an even address. I would check the reference manual for your particular processor as to alignment restrictions on the code.</P><P>&nbsp;</P><P>---Tom</P></BODY></HTML> Wed, 17 Aug 2011 23:59:11 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MC51QE128-RAM-Function-alignment/m-p/159999#M4987 J2MEJediMaster 2011-08-17T23:59:11Z