[MPC5746R] Disable the weak pull up in each pad during POR/RESET

[kiminkim]

Hello,

I want to disable the weak pull up in each pad during Power on Reset or RESET.

In MPC5746R, weak pull up of all port are enabled as a default when it's POR/RESET.

After it's POR/RESET, I could disable the weak pull up by configuring the SIUL_MSCR[WPUE].

But, it need to be disabled when it's POR/RESET because it can cause the unwanted output.

Please share the solution if you have for this query.

Thank you.

Best regards,

Kimin

[davidtosenovjan]

It seems it is just not possible to configure it before reset. I would recommend to install stronger external pull-down resistors for pins where it could cause issues to you.

[alexvinchev]

I've also faced this issue on MPC5748G. Each reset causes ~100ns high pulse on GPIOs, so it is nightmare to debug code when these GPIOs are used to reset external peripheral or slave MCU...