What is the difference between PIN and port in AVR?
What is the difference between PIN and port in AVR?
PORT is used for enabling/ disabling the internal pull-up resistor in case of input pin and it is also used for setting the pin as HIGH/ LOW in case of output pin.
What is the difference between a port and a pin?
A pin is a physical connection for a single net. In schematics and HDLs, pin and terminal are used interchangeably to represent the the point where the connection to a network is made. A port is a group of pins representing a standard interface. In the physical world, a port is usually more than one pin.
What is an AVR pin?
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. These pins are usually organized in groups of eight and referred to as a port.
How do you read AVR pins?
The pins in each port are numbered 0-7 and we set them high or low by writing a 1 or 0 to the associated bit in the register. For example, to set pin 3 high, we need to make sure that the ‘3’ bit of PORTB is a one. The ‘3’ bit is actually the fourth from the right. The bits are numbered from 0 going from right to left.
What are the digital input and output pins 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. These pins are usually organized in groups of eight and referred to as a port.
What happens when PORTx is disable on AVR?
When the PORTx register disables the pull-up resistor the input will be tri-stated, leaving the pin left floating. When left in this state, even a small static charge present on surrounding objects can change the logic state of the pin. If you try to read the corresponding bit in the pin register, its state cannot be predicted.
What’s the difference between 1 and 0 in AVR?
In PIC devices, a value of 1 is used for inputs and a value of 0 is used for outputs, but for AVR devices the reverse is true; 1 refers to an output while 0 refers to an input. So let’s say if we want to configure all the pins on PORT B as outputs, we would simply use the following code:
Can you turn off pull ups on AVR ports?
Normally, the pull-up enabled state is fully acceptable, as a high impedance environment will not notice the difference between a strong high driver and a pull-up. If this is not the case, the PUD bit in the MCUCR Register can be set to disable all pull-ups in all ports.