MPC5674 Rx individual mask register write failure sometimes

[Songzl]

FlexCAN module in freeze mode. write  in rx individual mask register to an constant(0x00FFFF00) as follow snapshot, but after write, the value in it is not expected, it's a random value.  this issue occurs sometimes, not always. not sure whether it's a defect or any other point I miss

[PetrS · Accepted solution]

Hi,

before access to RXIMR be sure module is really in Freeze mode and MBFEN is set.
Check if PE clock is not higher then peripheral clock. Try to use different init for setting CLKSCR and freeze mode, for example

BR, Petr