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LPC11C24 enter ISP mode abnormally

Question asked by Kunsen Chen on Mar 2, 2020
Latest reply on Mar 3, 2020 by xiangjun.rong

    The LPC11C24 user program can be run at the beginning, but after a few months of testing, serveral chips enter the ISP abnormally, and then each time after power-on, they still enter the ISP mode. Only by erasing the chip program and reprogramming can it return to normal. I have detected that the ISP pin and power pin using a oscilloscope and when LPC11C24 is power on, the  ISP pin is high level. It seems that it is not a hardware problem, so I suspect it is a software problem. Is there another way to enter ISP mode?