RT1170 GPIO Operating Range setting

[Eugene3]

How can I set 3.3V mode or 1.8V mode for GPIO_SD?

GPIO_LPSR, AD and DISP have register for supply voltage range selection. But I couldn't find similar register for GPIO_SD and EMC.

Is the mode simply selected by the NVCC_XX power rail voltage without register setting?

[jingpan · Accepted solution]

Hi @Eugene3 ,

The pad work in 3.3v mode or 1.8v mode is designed by hardware. NVCC_SD is the power source of SD pin group. You can refer to RT1170 EVK schematic for how to switch.

Regards,

Jing

[Eugene3]

Hi @jingpan 

Can I also apply same way to other power rails to set 1.8V/3.3V mode?

ex. If I use 1.8V power to NVCC_EMC1, will GPIO_EMC_B1_XX work in 1.8V range?

[jingpan]

Hi @Eugene3 ,

Yes, it can.

Regards,

Jing

[Eugene3]

Thank you.

I understand.