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Hi,
my customer is using F28034, and the SYSCLK is set as 60MHz, XCLKOUT output is 15MHz to be measured.
when they do EFT test, they will observe XCLKOUT to be 7.2MHz and the PWM frequency change, which means the SYSCLK is changed.
When they remove the EFT pulses, the clock is still wrong.
They are using internal oscillator as the clock source, so they suspect that the internal oscillator is too easy to be influenced and caused the failure of EFT test.
I will check with the customer to see if the power(3.3V, 1.8V) is within our recommendation range during EFT test, but I don't consider power is the reason, because the clock is still wrong when they remove the EFT pulses.
Do you have any idea what else might be the reason for the wrong clock frequency?
Howard
Howard,
If the frequency is exactly 7.2 MHz everytime, it is unlikely that the trim registers are getting corrupted. In any case, I presume customer can check the contents of the trim registers to verify this.
Is the change in clock the only effect of the EFT test? Does it impact code execution in any way?
Would you be able to share with me offline the details of how the EFT tests are done?