Dears, I am using kea128 and kea32 for serie products development. everything works fine by demo board frdm_kea128. But problem occurs at my own PCB (both kea128 and kea32). A brand new manufactured board, before any software flash operation, the reset pin of the MCU output a pwm wave (see attached pocture). with or without(leave pin N.C.) a pull up resistor, the same. interesting is, the frequence of this wave is about 39kHz, the same as the MCU internal clock.
Conquence is: with S32DS 2018 it possible to debug, but the codes disappear after power on reset; With CodeWarrior 11.1, after clicking debug, the bar runs till 99%(downloading...) then error prompts up: can not reset the process.
Totally have no idea why this happens. Please help.