RM57L843: Hercules RM57 HW Questions & HalCoGen

Hi Sunny,

Sunny Ubergeek said:

How do we properly select for i.e., GPIO outputs to driven versus open drain?

First, we should select DIR checkbox to act the pin as output pin, like as below:

If we didn't check the PDR checkbox then the pin will act as normal driven, i mean not an open drain pin.

If you check the PDR checkbox then pin will act as an open drain pin:

In open drain selection you can remove internal pullup and can use external pull-up if needed.

I hope you already aware that in open drain condition the logic-high will not be drive by the controller GPIO, instead of it will open the drain pin and we can drive the logic high using pull-up resistor.

Sunny Ubergeek said:

PWM NHET – Does open drain NOT SELECTED result in a driven output?

Yes, if you didn't select the PDR checkbox then it should be driven output. I mean not an open drain pin.

Sunny Ubergeek said:

We know that master output is a driven pin, but this driver is not selected by default when the SPI us is selected as an option for setting these pins. So is it still a driven pin even if it is not selected is a driven pin. (see below pic)  

Yes, by default master out pin will act as output only and its output also in driven mode only. 

If you want this pin to be open drain, then enable DIR and PDR check boxed.

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Thanks & regards,
Jagadish.