Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Before answering your question, I'd like to learn more information about this 'issue'. Whether you can clarify these below inquires.
1) Sharing the Option for Target in Keil.
2) Which board and demo you.
3) The voltage status of the ISP pin.
Have a great day,
TIC
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------