Functional Description; I2C Protocol - NXP Semiconductors MKL27Z128VFM4 Reference Manual

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Indicates if the Tx or Rx buffer is empty.

Tx or Rx buffer is not empty and cannot be written to, that is new data cannot be loaded into the

Tx or Rx buffer is empty and can be written to, that is new data can be loaded into the buffer.

36.5 Functional description

This section provides a comprehensive functional description of the I2C module.

The I2C bus system uses a serial data line (SDA) and a serial clock line (SCL) for data

All devices connected to it must have open drain or open collector outputs. A logic AND

function is exercised on both lines with external pull-up resistors. The value of these

resistors depends on the system.

Normally, a standard instance of communication is composed of four parts:

1. START signal

2. Slave address transmission

3. Data transfer

4. STOP signal

The STOP signal should not be confused with the CPU STOP instruction. The following

figure illustrates I2C bus system communication.

Freescale Semiconductor, Inc.

I2Cx_S2 field descriptions (continued)

KL27 Sub-Family Reference Manual , Rev. 5, 01/2016

Chapter 36 Inter-Integrated Circuit (I2C)