Means its setting determines whether port pins will be used for input or output. (x can be replaced by A,B,C,D as per the AVR you are using)ĭDRx (Data Direction Register) configures data direction of port pins. Bit0 of these registers is associated with Pin0 of the port, Bit1 of these registers is associated with Pin1 of the port, …. Every bit in those registers configure pins of particular port. Every port has 3 registers associated with it each one with 8 bits.
Got that ? If not read this para again.Ītmel AVR is 8 bit microcontroller. To change setting for one single pin of the port, you have to change a particular bit in associated register. Thus in order to change setting for one port, you have to change setting for all port pins of that port. NOTE : I will frequently refer to ‘configuring pin’ or simply ‘pin’.
2.2 Blink LEDs on PB with different patterns according to given input.
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