MC9S12 Code memory was erased

[hs3401]

Now I am using MC9S12DJ128 in our equiptment.

But I have one problem.

The codes I have writed in MC9S12DJ128 flash memory is erased sometimes.

When the code is erased, I write the codes again and it works well.

I don't know why.

This do not happen so often.

But, you know, it can be a big trouble.

Please help me to solve this problem!

[Alban]

Hello,

If you do have Flash programming routines inside your MCU, your ERASE function is maybe called.
There is a way to prevent this by securing your Flash, but it doesn't solve the root of the issue and could produce other un-desired behaviour.

Is it the whole Flash being erased or an area in particular ?
May be your code runs away and starts the erase routine. Try and put a special instruction to stop the MCU at start of routine if you can reproduce the issue.

Cheers,
Alban.