What is the difference between reading the value of the pin register vs the port register?

3 Answers. The pins are what stick out of an IC, and connect electrically to the outside world. Ports are represented by registers inside the microcontroller, and allow the program (firmware) to control the state of the pins, or conversely, read the state of the pins if they are configured as inputs.

What is PINB register?

The Port B Input Pins address – PINB – is not a register, and this address enables access to the physical value on each Port B pin. When reading PORTB, the PORTB Data Latch is read, and when reading PINB, the logical values present on the pins are read.

What is DDR register?

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(). DDR and PORT registers may be both written to, and read.

What is difference between pin and port?

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 DDRD in AVR?

The DDRD register sets the direction of Port D. Each bit of the DDRD register sets the corresponding Port D pin to be either an input or an output. A 1 makes the corresponding pin an output, and a 0 makes the corresponding pin an input.

What are DDRx registers?

How many pins are in port A?

Each of the 9 pins usually connects to a wire. Besides the two wires used for transmitting and receiving data, another pin (wire) is signal ground. The voltage on any wire is measured with respect to this ground.

What is the concept of X Y and Z register in AVR?

XYZ is a pointer register, either X or Y or Z. YZ is a pointer register, either Y or Z. s is a bit number in the status register (0 = C, 1 = Z, etc., see the list above) b is a bit number in a general-purpose or I/O register (0 = least significant, 7 = most significant)

What is PORTx register?

PORTx: This register is used to send the data to port pins. Writing 1’s to PORTx will make the corresponding PORTx pins as HIGH. Similarly writing 0’s to PORTx will make the corresponding PORTx pins as LOW.

What is the meaning of 1>> pinb0?

The statement “1<

How do I read pinb0?

In any case, PINB0 is defined as 0, zero. But wait – there are three parts to an AVR port, PORTx, PINx and DDRx, for the output register, the input register, and the data direction register, and each of them has its own set of constants. This statement, then, should actually read. PORTB ^= 1 << PORTB0.

What is the difference between PORTB and Pinpin?

PIN registers correspond to the state of inputs and may only be read. PORTB maps to Arduino digital pins 8 to 13 The two high bits (6 & 7) map to the crystal pins and are not usable PORTC maps to Arduino analog pins 0 to 5. Pins 6 & 7 are only accessible on the Arduino Mini

What is the difference between ddrddr and PORTB and pinb?

DDR and PORT registers may be both written to, and read. PIN registers correspond to the state of inputs and may only be read. PORTC maps to Arduino analog pins 0 to 5. Each bit of these registers corresponds to a single pin; e.g. the low bit of DDRB, PORTB, and PINB refers to pin PB0 (digital pin 8).