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Simply programming the MCU with an empty main() will do the job. All GPIOs will default to high impedance inputs, so they won't disturb the rest of the circuit beyond a little parasitic capacitance. T …

"High pull" and "low pull" aren't terminology I've seen used anywhere, including in the document you link to. There is a difference between a pullup and driving high, or a pulldown and driving low. E …

You don't specify how TPL0102's supply pin is connected (a circuit diagram would be helpful here), but given its absolute max voltage of 7V, it's a safe bet it's not to the 11V supply. Digital potent …

More likely than not, your device is finding a ground connection via its internal protection diodes and another pin that's connected to ground. Without a ground reference of its own, that pin appears …

The current is limited by the output impedance of the driver, and the input impedance of the receiver. A GPIO pin generally has very low output impedance in output mode (at most tens of ohms, likely l …

Pullups on input pins like this exist as a convenience - for instance, so they can be connected to buttons as you suggest in your question - but they don't prevent you from being able to drive them hi …

The maximum power dissipation is a rating of how much power the package can physically dissipate. How the MCU ends up drawing that much power is another matter; for instance, it could be simply a lot …

18k/2k will give you exactly 10%, which is what you say you need, though the total resistance to ground of 20k is a bit on the low side, depending on your ADC and whether or not you're using a buffer …

In C, you can use bit-shift and masking to extract each byte of a longer number: lower_8bits = value & 0xff; upper_8bits = (value >> 8) & 0xff; And you can 'reassemble' the number from bytes by doi …

SLIP is a protocol for conveying IP traffic over a serial line; it sits one layer above UART, SPI, etc, in the OSI network stack. SLIP over SPI should be largely the same as SLIP over UART, except fo …

The FET you link to is not suitable for your application. Taking a look at the "typical characteristics" table, we see this: Vgs(th) is listed as between 2 and 4 volts - already it could be higher …

An illustrative example or two may help here. Take a look at the following hypothetical circuit: simulate this circuit – Schematic created using CircuitLab Suppose to start both A and B are hi …

In the ISR, you do a couple of checks that depend on the value of flag, then unconditionally increment it. In your normal case, what happens is this: Main routine sets flag to 0 ISR runs, sees flag …

If you want to protect the microcontroller against signals outside the rails, a series resistor like R2 in the second schematic is useful, though it will limit its frequency response. …

Your first approach is unlikely to work very well because analog multiplexers don't exhibit good resistance matching between channels - in the case of HEF4067B, it's listed as up to 25 ohms mismatch. …