LPC Microcontrollers中的主题 LPC55 / LPC55S36 ISP over USB

LPC55 / LPC55S36 ISP over USB

BrKu — Mon, 03 Nov 2025 13:33:41 GMT

Good morning,

https://community.nxp.com/t5/LPC-Microcontrollers-Knowledge/LPC55-Don-t-Use-ISP-USB0-for-firmware-update/ta-p/1277983

states to not use USB for ISP due to clock drift. Does that apply to the LPC55S36? I was confused to see it in the forums but not in the datasheets or errata.

Thanks

Re: LPC55 / LPC55S36 ISP over USB

Pablo_Ramos — Mon, 08 Dec 2025 17:00:31 GMT

Hello,

The information was shared directly to your distributor, please reach out to him for the answer.

Regards,

Pablo

Re: LPC55 / LPC55S36 ISP over USB

BrKu — Thu, 11 Dec 2025 11:16:19 GMT

For posterity - our distributor reported that NXP reported the following:

After discussion with the internal team, the internal team believes our LPC5536's ROM code should support FRO trim by full speed USB SOF frame, then the FRO accuracy can match full-speed USB requirement.

There should be no concern on the FRO accuracy, still, we would recommend you perform the test on your devices to validate if this works correctly on your side.