STM8S datasheet(288/467 Pages) STMICROELECTRONICS

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Inter-integrated circuit (I2C) interface

RM0016

288/467

DocID14587 Rev 14

Inter-integrated circuit (I2C) interface

21.1

I2C introduction

I2C (inter-integrated circuit) bus interface serves as an interface between the

microcontroller and the serial I2C bus. It provides multi-master capability, and controls all

I2C bus-specific sequencing, protocol, arbitration and timing. It supports standard and fast

speed modes.

21.2

I2C main features

•

Parallel-bus/I2C protocol converter

•

Multi-master capability: the same interface can act as Master or Slave

•

I2C Master features:

–

Clock generation

–

Start and Stop generation

•

I2C Slave features:

–

Programmable I2C Address detection

–

Stop bit detection

•

Generation and detection of 7-bit/10-bit addressing and general call

•

Supports different communication speeds:

–

Standard speed (up to 100 kHz),

–

Fast speed (up to 400 kHz)

•

Status flags:

–

Transmitter/receiver mode flag

–

End-of-byte transmission flag

–

I2C busy flag

•

Error flags:

–

Arbitration lost condition for master mode

–

Acknowledgement failure after address/ data transmission

–

Detection of misplaced start or stop condition

–

Overrun/underrun if clock stretching is disabled

•

3 types of interrupts:

–

1 communication interrupt

–

1 error condition interrupt

–

1 wakeup from Halt interrupt

•

Wakeup capability:

–

MCU wakes up from Low power mode on address detection in slave mode.

•

Optional clock stretching

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