Hello All:
We got a boot up problem.
Our project use the LPC1820FBD144, the power source from USB VBUS.
I take USB cable plug in and plug out repeatedly.
Or press the reset button repeatedly
It sometime will boot up fail.
The failure rate is 1~2 / 10 time.
Is that Known Issue?
Because of I found the documents " LPC18XX-RN.pdf "
It mentions the similar problem.
" In a few hundred reset cycles one cycle might fail with a Hard Fault right after PLL initialization code "
If it is this known issue, how can we do?
If anyone meet the same problem.
or ,
If anyone has solution can resolve it.
Thanks
Hi Jeremyzhou:
Thanks for you reply.
I already found the cause.
That is NXP1820 PLL Clock frequency ramp-up need some delay for stable.
So, I add delay for it. And repair the problem.
The way is share for other user. See the bellow figure.
Hi Chen Blake,
Thank you for your interest in NXP Semiconductor products and the opportunity to serve you.
Before answer your question, I was wondering if you can tell me which boot mode you choose.
I'm looking forward to your reply.
Have a great day,
Ping
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The boot mode is SPIFI.
There are some things in the errata that may be relevant
Thanks for your reply and share!