Issue with flashing the program due to reset pin low on KL05Z32

[sureshjaggal]

Dear Folks,

The reset pin is connected to internal pull up according to the that datasheet.

The reset pin on my PCB measures 1.5 Volts, but  I am expecting 3.3v  due to which i can not Flash my microcontroller.

The reset pin measures 1.5v when connected with a 3k resistor and  2.5v when connected with 1k resistor  (Please find the resistor circuit in the attachment).

I can Flash my microcontroller when the reset pin measures 2.5v.

Questions

1) Why does the reset pin measure 1.5v when we have 3k resistor.

Best regards,

Suresh Jaggal

[Robin_Shen]

Hi Suresh

I am not sure whether you have observe the waveform on reset pin by using oscilloscope.

If the waveform seems periodic oscillation, you may check the RESET_b pin and the NMI_b pin.

You can check the circuits according to the "2.1.3.4.1 RESET_b and NMI_b" of KLQRUG.pdf

Best Regard

Robin