Can only Transmit over the Serial Communication Interface, when connected to Debugger.

[malikos]

I am currently using a MC9S12ZVM Family. I am trying to transmit some data over the serial communication interface (via Lin). However I can only successfully transmit the data when I am connected to Code Warrior and when the debugging session is active. I do not want to use the debugger when transmitting the data (would do it via Canoe). Is there a way of configuring the SCI so that you do not need to use the debugger to send the information over the SCI. 

I attach my configuration

[lama · Accepted solution]

Hi,

it smells like there is something initialized twice and is allowed to be only once.

You use Processor Expert setup and believe you made some adjustment.

Some registers are write once only. For example MODRR, CPMUCOP register which routes peripherals to pins. When you use normal mode (no BDM) the if it is set for the first time then it is not re-writable.

Moreover, you only describe it does not communicate. Have you tested the MCU is working and not still in the reset phase or in loop start-reset caused by COP setup...write once only?

Best regards,

Ladislav

[malikos]

Great. That was the issue. Writting twice to the MODRR0 rgister

[malikos]

Any ideas? The serial communication interface is Serial Communication Interface (S12SCIV6)