LPC844 ISP entry pin timing

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LPC844 ISP entry pin timing

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r_poelstra
Contributor II

Hi,

 

I've a rather large capacitor connected to the ISP entry pin due to EMC issues. I'm using an LPC844.

I now have the problem that the part sometimes enters ISP mode on boot due to the capacitor not charging fast enough.

Is there any timing information available for the ISP entry pin so I can make sure that either the capacitor gets charged fast enough or that the reset signal is delay just long enough?

Please note that I want to keep the ISP entry feature, as there is also a button connected to force ISP mode. So I can't just disable it in FAIM/CRP.

 

Thanks in advance.

 

Kind regards,

 

Remco Poelstra

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