- Send the START bit (S).
- Send the slave address (ADDR). …
- Send the Read(R)-1 / Write(W)-0 bit.
- Wait for/Send an acknowledge bit (A).
- Send/Receive the data byte (8 bits) (DATA).
- Expect/Send acknowledge bit (A).
- Send the STOP bit (P).
How do you read I2C protocol?
I2C is a serial communication protocol, so data is transferred bit by bit along a single wire (the SDA line). Like SPI, I2C is synchronous, so the output of bits is synchronized to the sampling of bits by a clock signal shared between the master and the slave. The clock signal is always controlled by the master.
How is I2C pronounced?
I2C is ordinarily pronounced “
I-two-C”
, though it is also sometimes written as IIC (and pronounced “I-I-C”) or I
2
C (pronounced “I-squared-C”).
How do I read an I2C address?
A 7-bit I2C address includes a 7-bit slave address in the first 7 bits of a byte. The
eighth bit
(the bit in the Least Significant Bit position) is the read/write flag. A 0 in the eighth bit indicates a write and a 1 in the eighth bit signifies a read.
What are I2C commands?
There are two main commands that are used to work with I2C devices:
i2cget and i2cset
. Using these commands you are able to access the data that is stored in registers (a location in the memory) on the device and in that way control the device.
What is I2C format?
I2C stands for Inter-Integrated Circuit. It is
a bus interface connection protocol incorporated into devices for serial communication
. It was originally designed by Philips Semiconductor in 1982. Recently, it is a widely used protocol for short-distance communication. It is also known as Two Wired Interface(TWI).
Where is I2C used?
The I2C bus protocol is most commonly used in
master and slave communication
wherein the master is called “microcontroller”, and the slave is called other devices such as ADC, EEPROM, DAC and similar devices in the embedded system.
What are the features of I2C bus?
I2C has many important features worth mentioning. It supports multiple data speeds: Standard-mode (100 kbps), Fast-mode(400 kbps), Fast-mode plus, High-speed mode (3.4 Mbps), and Ultra Fast-mode (5.0 Mbps) I2C communications. Other features include:
Built in collision detection
.
What is the speed of I2C bus?
Data on the I2C-bus can be transferred at rates of up to
100 kbit/s in the Standard-mode
, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in Fast-mode Plus, or up to 3.4 Mbit/s in the High-speed mode.
How do you pronounce SPI?
SPI – ES –
PE – EYE
.
Is 0 a valid I2C address?
The only bad news about I2C is that
each I2C device must have a unique address
– and the addresses only range from 0 to 127 (aka 0 to 0x7F hex).
What are I2C addresses?
All I2C addresses are
either 7 bits or 10 bits
. The use of 10 bit addresses is rare and is not covered here. All of our modules and the common chips you will use will have 7 bit addresses. This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127.
Is I2C MSB first?
Data is transferred Most Significant Bit (MSB) first
. Any number of data bytes can be transferred from the master to slave between the START and STOP conditions.
What is another name for I2C?
Explanation: The i2c protocol also known as
the two wire interface
is a simple serial communication protocol that uses just pins of a microcontroller namely SCL and SDA.
Is I2C full duplex?
I2C is half-duplex communication and
SPI is full-duplex communication
. I2C supports multi-master and multi slave and SPI supports single master. I2C is a two-wire protocol and SPI is a four-wire protocol.
