Hey everyone, I'm trying to wrap my head around the I2C protocol and the intricacies of data transfer between the master and slave devices. Specifically, I'm confused about when the master transfers a bit to a slave device in terms of clock high, clock low, rising edges, and falling edges. Could s…

Do you have two Arduinos (UNO/NANO/MEGA)? If yes, then we can execute a simple data exchange program/skecth in ordder to get the answers of your queries.

[image] kittu20: Specifically, I'm confused about when the master transfers a bit to a slave device in terms of clock high, clock low, rising edges, and falling edges. Here ya go, direct from NXP. All the detail you could ever want. UM10204.pdf (733.4 KB)

I²C I2C (Inter-Integrated Circuit; pronounced as “eye-squared-C”), alternatively known as I2C or IIC, is a synchronous, multi-master/multi-slave (controller/target), packet switched, single-ended, serial communication bus invented in 1982 by Philips Semiconductors. It is widely used for a…

[image] GolamMostafa: Do you have two Arduinos (UNO/NANO/MEGA)? If yes, then we can execute a simple data exchange program/skecth in ordder to get the answers of your queries. I have only one mega256. I'm interested in understanding the interplay of clock high, clock low, rising edges, and f…

[image] kittu20: I'm interested in understanding the interplay of clock high, clock low, rising edges, and falling edges when the master sends a single bit that the slave receives The NXP (formerly Philips - the inventors of I2C) document is the definitive source for that. See Post #4.

[image] awneil: The NXP (formerly Philips - the inventors of I2C) document is the definitive source for that. I have gone through that documents I think In this scenario, the master transfers the bit during the falling edge (high to low transition) of the clock, and the slave reads the bit o…

I2C is a byte oriented protocol which means that 8-bit data are sent/received in ONE GO. It is a synchronous transmission; where, a data bit is pushed-in into Slave and pushed-out from Slave in response one of four parameters of the SCL signal (Rising edge, HIGH, Falling edge, LOW). The following di…

[image] kittu20: the master transfers the bit during the falling edge (high to low transition) of the clock, and the slave reads the bit on the rising edge (low to high transition) of the clock. Yes, it is indeed that simple. The I2C bus was created around 1980. Think in 1980s logic chips wit…

[image] GolamMostafa: The following diagram may be helpfult for you. I'm finding this diagram very helpful in understanding I2C data transfer. Kudos to you for contributes! I do have a specific query – I'm curious about the source of the diagram. Was it created by you ? Can we also get a dia…

I2C Data Transfer

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blh64 August 30, 2023, 2:57pm 2

Most (all) i2c devices have the breakdown on the i2c protocol as part of their datasheet.
In a nutshell, SDA (data) changes state while SCK (clock) is low and must be valid on the rising edge of SCK.

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I2C Data Transfer

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