topic Re: alt in i.MX RT Crossover MCUs

alt

sapirbuz — Mon, 09 May 2022 15:24:00 GMT

How can we control the ALT modes and switch between the modes?

Can the Jtag GPIO (defined as ALT 0) be used while ALT 5 mode is active?

Do all the NXP signals are in the same ALT mode simultaneous?

Re: alt

jeremyzhou — Tue, 10 May 2022 01:15:37 GMT

Hi @sapirbuz ，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) Can the Jtag GPIO (defined as ALT 0) be used while ALT 5 mode is active?
-- No, I'm afraid not.
2) Do all the NXP signals are in the same ALT mode simultaneous?
-- Yes.
Have a great day,
TIC

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Re: alt

sapirbuz — Tue, 17 May 2022 12:33:49 GMT

Thank you,

According to the i.MX RT1050 Processor Reference manual (chapter 10), it looks like each pin can be defined on another ALT mode. I didn't see any mention that all the 197 pins are on the same ALT mode simultaneously.

Can you please refer me to the note that mentions that?

Re: alt

jeremyzhou — Wed, 18 May 2022 02:01:19 GMT

Hi，
Thanks for your reply.
Let me clarify my answers, I mean you can configure the MUX_MODE to ALT0 or other for all pins manually, sorry for bringing any misunderstanding to you.
2) Do all the NXP signals are in the same ALT mode simultaneous?
-- Yes.

Have a great day,
TIC

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Re: alt

sapirbuz — Thu, 19 May 2022 13:41:36 GMT

Hi,

so, can i define pin GPIO_SD_B1_03 as ALT1 (FLEXSPI_B_DATA0) at the same time GPIO_AD_B1_12 is defined as ALT0 (FLEXSPI_A_DATA1),

at the same time pin GPIO_EMC_24 will be in mode ALT5?

Re: alt

jeremyzhou — Fri, 20 May 2022 02:52:38 GMT

Hi @sapirbuz

Thanks for your reply, and yes, you can.
Have a great day,
TIC

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