What is DDR in AVR?
The data direction register (DDR) is most likely the first register that you configure since the DDR register determines if pins on a specific port are inputs or outputs. The DDR register is 8 bits long and each bit corresponds to a pin on that I/O port.
What is AVR port?
Digital Input/Output Ports on AVR. AVR® 8-bit microcontrollers control applications through their digital Input and Output (I/O) pins. These pins can monitor any voltage present as a high impedance input and supply or sink current as a high or low voltage digital output.
What is the difference between DDR and port?
The DDR register, determines whether the pin is an INPUT or OUTPUT. The PORT register controls whether the pin is HIGH or LOW, and the PIN register reads the state of INPUT pins set to input with pinMode().
What is the role of DDR register in inputting data for AVR controller?
Data Direction Register configures the data direction of port pins. These registers are used for determining whether port pins will be used for input or output. On writing 1 to a bit in DDRx makes corresponding port pin as output, while writing 0 to a bit in DDRx makes corresponding port pin as input.
What is the meaning of AVR?
Short for automatic voltage regulator, AVR is a hardware device used to maintain a voltage to electronic devices.
What is difference between port and PIN?
A port is a group of pins representing a standard interface. In the physical world, a port is usually more than one pin. But in Verilog/VHDL, a port is usually just one pin. A port can be a connection in a logical hierarchy that has no physical representation.
What is the purpose of PORT registers?
The PORT register is the latch for the data to be output. When the PORT is read, the device reads the levels present on the I/O pins (not the latch). This means that care should be taken with read-modify-write commands on the ports and changing the direction of a pin from an input to an output.