The Arduino Mega is a microcontroller board based on the ATmega ( datasheet). It has 54 digital input/output pins (of which 14 can be used as PWM. ATmega/V/V/V/V/V [DATASHEET]. Q–AVR–02/ 1. Pin Configurations. Figure TQFP-pinout. This is supposed to be an atmega with SPI ethernet from the . From Atmega datasheets, it says that the pin will go high with minimum.
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I means for input and output there must be some address tell where input data is stored or address tell where data is ouput. Furthermore, if 8 pin of one port is configured to be mixed between output and input then how the data of each bit of each pin is organized to be store in a register which contain 8 bit. In short, this means that there is an internal resistor that is connecting the pin to your positive voltage, thus driving it high unless a connection to GND happens.
ATMEGA Datasheet(PDF) – ATMEL Corporation
Sparkfun has an amazing tutorial. Should your PORT register have a mix of pins defined as inputs and outputs, you can still read the values just fine.
To read the pins defined as inputs, you’d read the PIN register like so: As for the outputs though, you can just set the PORTx register and you won’t have to datzsheet about it affecting the inputs: Arduino has a good article on this.
I have highlighted some parts to be discussed: The output PORT green is a register which you can write to and read. When you read it you are seeing the value you put there, which may not be the same as the level on the pin.
Reading the PIN ‘register’ purple will always give you the current level on the pin. It does this by feeding the output of the PORT flipflop back into its input and clocking it to create a divide by 2 counter yellow.
Home Questions Tags Users Unanswered. Sparkfun has an amazing tutorial Should your PORT register have a mix of pins defined as inputs and outputs, you can still read the values just fine.
(PDF) ATMEGA256RFR2 Datasheet download
Funkyguy 2, 1 13 The current value on a pin is always available as PINxn. Sign up or log in Sign up using Google.
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ATMEGA 데이터시트(PDF) – ATMEL Corporation