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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 …

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 …

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 …

To add to the list of applications, they're also useful when dealing with input signals faster than you could process directly in the microcontroller. …

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. …

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 …

Building a constant current load with an opamp is a fairly straightforward way to do this. Take a look at the first diagram in this post, for instance: An opamp adjusts its output to make the volta …

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 …

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 …

Your calculation for the battery voltage is wrong. Assuming adcReading varies from 0 to 1023, it should look like this: batteryVoltage = (adcReading * 30) / 1023 Note though that denoting voltage l …

I'm in the early stages of designing a development board around Cypress Semiconductor's PSoC 3 and 5 range of chips. Much like the Arduino, I'd like the programming experience to be very easy, and tha …

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 …

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 …

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 …