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

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

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malikos
Contributor I

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.

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danielmartynek
NXP TechSupport
NXP TechSupport

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

 

 

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