DRV8300-Q1: Is it possible to use motor driver as GPIO?

Tool/software:

Hello.
I'm a DRV8300 three-phase motor driver
The two phases are used to control the normal DC motor by PWM.
I use GHA and GLA, GHB and GLB.
My question is, if you give PWM to 100%, the motor won't rotate. 255 and 0. But if you set it to 255 and 1, it will rotate, but this isn't 100%, right?

The second question I want to give you is not PWM, but when I give SET, CLEAR as GPIO, it doesn't rotate. After all, it's the same situation as not rotating at the first PWM 100%.

Is it supposed to be like this?