Kinetis MicrocontrollersのトピックKL02Z reset pin datasheet confusion

KL02Z reset pin datasheet confusion

hughesk — Wed, 19 Nov 2014 02:02:56 GMT

Page 9 of Rev4 of Document KL02P20M48SF0 states:

2. The reset pin only contains an active pull down device when configured as the RESET signal or as a GPIO. When

configured as a GPIO output, it acts as a pseudo open drain output.

My question is:

Why does this state that the reset pin contains an active pull down device? The reset for this chip is active low, so shouldn't the chip contain a pullup resistor?

Or, am I reading this incorrectly and there is both a pullup resistor and an optional pulldown device?

Thanks!

Re: KL02Z reset pin datasheet confusion

mjbcswitzerland — Wed, 19 Nov 2014 05:46:13 GMT

The text does look to be confusing or possibly not quite right.

If you check the user's manual it should however be clear that the RESET_b pin has a pull-up when configured as reset. See several sections, which all reinforce this:

Table 6.1

Regards

Mark

Re: KL02Z reset pin datasheet confusion

hughesk — Wed, 19 Nov 2014 17:09:12 GMT

Thank you, this clarifies things. At the very least, that's 3 pullup references to 1 pulldown. I'll also check this in-circuit.