DRV8428E: Micro step Mode selection with HiZ

Dear Team,

I need to use all the micro step selections using DRV8428.

in this driver the all stepping given in selection table. but some of them are HiZ mentioned.

How to give HiZ input to M1 mode pin selection. During run mode how to change the M1 pin mode as HiZ.

also 330K ohms GND connection need to give for another micro stepping. How this made possible with single MCU pin