regarding the datasheet of the 9S12ET familly we have acces to on 9S12J2XET256J2MAL.
on the ordering information we can read:
Second digit refers to mask or firmware revision
Numeric second digit = mask rev. (e.g.1=1M48H) A=firmware revA, version ID=0xFFFF B=firmware revB, version ID=0x0004, W=TSMC11, Blank= flexible fab
J=TSMC3, F=ATMC, Numeric second digit = mask rev. (e.g.1=1M48H)
I understand the J, but what is the firmware revision : is it related to a bootloader, to a can controler version or other peripheral associated to a firmware ?
if not why there are numerous version:
eg: 9S12XET256BVAL, 9S12XET256J1VAL as an example ? could we use anyone of these 2 version (are they 100 % firmware compatible) ?