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RTC - faking the external XTAL | Cypress Semiconductor

RTC - faking the external XTAL

Summary: 1 Reply, Latest post by danaaknight on 02 Sep 2015 12:12 PM PDT
Verified Answers: 0
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user_365962704's picture
143 posts


Another n00b question to my collection, i was trying to make the RTC work on the 5LP prototyping kit, external 32.768 KHz XTAL is needed.

Is it possible to generate that clock inside the PSoC, connect it to a pin, connect that pin externally to the XTAL input pins, and fake it?

Already create 32KHz clock and output it on a pin, i got 31.98KHz signal, see atached to see the idea.

user_14586677's picture
7646 posts

The 32 Khz onboard oscillator has special bias conditions that make it

a non CMOS compatible input if I am not mistaken. So consider filing a

CASE and asking that, as well as can you AC couple to the xtal input side

pin an external 32 Khz source, that might work. Post the answer back here

for the benefit of the forum.


To create a technical or issue case at Cypress -


“Technical Support”

“Create a Case”


You have to be registered on Cypress web site first.


Regards, Dana.

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