MPC5xxxのトピックRe: MPC5634M FlexCAN Individual Rx Mask Register Can not write

MPC5634M FlexCAN Individual Rx Mask Register Can not write

413515651 — Wed, 29 Mar 2017 06:26:21 GMT

I do that:

CAN_A.MCR.B.MBFEN =1; //Use Individual Rx Mask Register

CAN_A.RXIMR[4].B.MI = 0x00001000;

but:CAN_A.RXIMR[4].R is Always Read 0x00000000;

MPC5634M datasheet

Re: MPC5634M FlexCAN Individual Rx Mask Register Can not write

PetrS — Wed, 29 Mar 2017 07:59:35 GMT

Hi,

The Individual Rx Mask Registers can only be accessed by the CPU while the module is in Freeze Mode and MBFEN is set. Out of Freeze Mode, write accesses are blocked and read accesses will return “all zeros”.

So be sure the FlexCAN is allowed to enter Freeze mode (MCR[FRZ] set) and Freeze mode is really entered once you break debugger (FRZACK and NOTRDY flags set).

BR, Petr

Re: MPC5634M FlexCAN Individual Rx Mask Register Can not write

413515651 — Fri, 07 Apr 2017 09:32:43 GMT

Thank you！！ I solved it.