The MPC5741 chip's Flexcan module's MCR register's IRMQ was not written successfully

[kun_zeng]

According to the UM,This bit can be written only in Freeze mode。But I'm already in freeze mode,It's no use writing 1,The register value was found to be 0 when debugging with lauterbach,Before that,FRZ bir is 1, FRZACK bit is 1, and HALT bit is 0。Even if I don't set HALT to 0,When I've set up the MAXMB bit, HALT automatically goes to 0。

     Could you tell me the reason why I failed to write IRMQ？

[PetrS]

Hi,

the code is wrong, clearing HALT bit should be last instruction during initialization.

Anyway you should be able to set IMRQ using debugger in debug mode or not?

BR, Petr

[kun_zeng]

Hi,

  Petr, Thank you very much! You are right,clearing HALT bit should be last instruction during initialization.