Anwar Husen Gokavaram

TJA1043 Not working after Power on Reset of Micro

Discussion created by Anwar Husen Gokavaram on Sep 16, 2016
Latest reply on Sep 23, 2016 by Anwar Husen Gokavaram


I am using the TJA1043 Transceiver in my project. I am facing the below issue.

In TJA1043 there are two pins i.e. En and STBN to control the different modes of the it.

I am confrolling these pins using the Digital output pins of a microcontroller in MSCAN initialization function before enabling the CAN(First enabling the TJA1043 then after some delay MSCAN initilization).

Issue description:
Flash the code on MC9S12ZVC64 and run from the debugger the CAN communication is working fine. I am able to transmit and receive the CAN frames.

When I perform the power on reset of a microcontroller, the CAN communication is not working. Other functionalities are working fine.

Find the snapshot of the interfacing circuit of a CAN Transceiver with the microcotroller.

Please let us know the possible reason and solution to resolve this issue at the earliest possible.