ST90T40 CAN communication problem at startup

[roberto239955]

Posted on June 20, 2003 at 11:53

ST90T40 CAN communication problem at startup

[roberto239955]

Posted on May 17, 2011 at 11:33

We have a problem with the interface between the uC ST90T40 and the SJA1000 controller:

- when we switch-on the circuit the first time, the communication between the card and the other equipment through the CAN communications network is right. - When we switch-off and switch-on the circuit with a time difference below 2 seconds (aprox.), with some micro controllers the CAN communication is right and with other micro controllers the same function isn’t right. The SJA1000 is a CAN communication controller and the uC is the responsible for configuring the SJA1000. The SJA1000 is accessed as a memory from uC using P0DR as alternate function: Do you know if it's something already known? thanks a lot Fiorenz

[romain2399]

Posted on May 17, 2011 at 11:33

The problem description is not enougth detailled: did you analyze the Port0 bus signals and the SJA1000 signals during a failure compare with a good device ?

[labafile]

Posted on May 17, 2011 at 11:33

Sir,

Did you ever find a solution to this difficulty? Sounds like something we just encountered?