Provide 8-bit PWM output with the analogWrite function. See the attachInterrupt function for details. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. These pins are connected to the TX-0 and RX-1 pins of the six pin header. Used to receive (RX) and transmit (TX) TTL serial data. In addition, some pins have specialized functions: Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. They operate at 3.3 or 5 volts (depending on the model). Each of the 14 digital pins on the Pro Mini can be used as an input or output, using pinMode, digitalWrite, and digitalRead functions.
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