topic Re: GPIO status between Power-on and POR in Kinetis Microcontrollers

GPIO status between Power-on and POR

masahirokiniwa — Fri, 26 Jan 2018 05:23:02 GMT

Hi,

Could tell me the GPIO status of Kinetis K27 between Power-on and POR?

I care that K27 output a pulse or drive to high/low during power-up sequence.

During POR, it will be status as Table 11-2 at reference manual. But I couldn't find the status between power-on and POR.

Best regards,

M.Kiniwa

Re: GPIO status between Power-on and POR

Robin_Shen — Tue, 30 Jan 2018 08:22:22 GMT

Hi Masahiro,

Sorry for the late reply!
Would you please attach waveform that you found? And tell us which pin are you testing.
I don't have K27 MCU. Maybe I can check it on FRDM-K28F.

Best Regards,

Robin

Re: GPIO status between Power-on and POR

masahirokiniwa — Tue, 30 Jan 2018 11:40:13 GMT

Hi Robin,

I didn't test it, yet. And it didn't occur a problem on FRDM-K28F.

But I must know the status between Power-on and POR for preventing a problem to the application.

Could you tell me its status by test or MCU design?

Best regards,

M.Kiniwa

Re: GPIO status between Power-on and POR

Robin_Shen — Thu, 08 Feb 2018 09:05:27 GMT

The K28 and K27 have same Mask Set, so I think the status of GPIO between Power-on and POR should be same too.

I observe the waveform of PTA30 pin on FRDM-K28F by oscilloscope, did not find pulse or drive to high.

Best Regards,

Robin

Re: GPIO status between Power-on and POR

masahirokiniwa — Thu, 15 Feb 2018 11:11:15 GMT

Hi Robin,

Thank you for your confirmation.

I see your test result. But I need this status about all GPIO and a guaranty of this result.

Could you confirm all GPIO and check MCU design?

Best regards,

M.Kiniwa