Use the KL05 MCU, battery (3V), use 10K or 4.7K resistor pull-up Reset PIN, decoupling capacitor of 1uF.
Measuring voltage Reset PIN is only about 1.48V, then after Jlink, Jlink Commander can identify MCU, but Jlink LEDs constantly flashing red light.
Remove decoupling capacitance, measurements the Reset PIN voltage is noly about 0.35V .
What is this problem? What do you do?
Previously used KL03 MCU have experienced the same problem
Circuit no problem, reviewed by Freescale technical support engineers