A single Data Byte 0x00 is transmitted by Serial TX on every StartUp

[malikos]

I am currently using a MC9S12ZVM Family. I am transmitting some data over the serial communication interface. However on every start up A single Data Byte 0x00 is transmitted. Is there any configuration in processor expert which can stop this.

[danielmartynek]

Hello @malikos,

What do you mean by startup?

When the transmitter gets enabled a preamble of all 1s is loaded into the shift register.

danielmartynek_0-1649319564883.png

Before that, the port is not controlled by the SCI module.

Which pins do you use for the SCI?

Can you share the project so that I can test it on my side?

Thank you,

BR, Daniel