The official website provides the register mode operation I2C, support stm8l stm8s, there are master from a variety of modes.

AN3281
AN3281\Project
AN3281\Project\STM8L10x
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Cosmic
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Cosmic\I2C_slave_opt.stw
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Cosmic\i2c_slave_opt.stp
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Cosmic\stm8_interrupt_vector.c
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Raisonance
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Raisonance\I2C_Slave_opt.stw
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\STVD\Raisonance\i2c_slave_opt.stp
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\inc
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\inc\I2c_slave_interrupt.h
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\inc\stm8l10x.h
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\src
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\src\I2c_slave_interrupt.c
AN3281\Project\STM8L10x\STM8L10x_I2C_Slave\src\main.c
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Cosmic
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Cosmic\I2C.stw
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Cosmic\i2c_master_interrupt.stp
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Cosmic\stm8_interrupt_vector.c
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Raisonance
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Raisonance\I2C.stw
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\STVD\Raisonance\i2c_master_interrupt.stp
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\inc
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\inc\i2c_master_interrupt.h
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\inc\stm8l10x.h
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\src
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\src\i2c_master_interrupt.c
AN3281\Project\STM8L10x\STM8L10x_I2C_master_interrupt\src\main.c
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Cosmic
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Cosmic\I2C_master_poll.stw
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Cosmic\i2c_master_poll.stp
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Cosmic\stm8_interrupt_vector.c
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Raisonance
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Raisonance\I2C_master_poll.stw
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\STVD\Raisonance\i2c_master_poll.stp
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\inc
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\inc\i2c_master_poll.h
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\inc\stm8l10x.h
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\src
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\src\i2c_master_poll.c
AN3281\Project\STM8L10x\STM8L10x_I2C_master_poll\src\main.c
AN3281\Project\STM8L15x
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Cosmic
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Cosmic\I2C_slave_opt.stw
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Cosmic\i2c_slave_opt.stp
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Cosmic\stm8_interrupt_vector.c
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Raisonance
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Raisonance\I2C_Slave_opt.stw
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\STVD\Raisonance\i2c_slave_opt.stp
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\inc
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\inc\I2c_slave_interrupt.h
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\inc\stm8l15x.h
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\src
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\src\I2c_slave_interrupt.c
AN3281\Project\STM8L15x\STM8L15x_I2C_Slave\src\main.c
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Cosmic
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Cosmic\I2C.stw
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Cosmic\i2c_master_interrupt.stp
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Cosmic\stm8_interrupt_vector.c
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Raisonance
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Raisonance\I2C.stw
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\STVD\Raisonance\i2c_master_interrupt.stp
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\inc
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\inc\i2c_master_interrupt.h
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\inc\stm8l15x.h
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\src
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\src\i2c_master_interrupt.c
AN3281\Project\STM8L15x\STM8L15x_I2C_master_interrupt\src\main.c
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Cosmic
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Cosmic\I2C_master_poll.stw
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Cosmic\i2c_master_poll.stp
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Cosmic\stm8_interrupt_vector.c
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Raisonance
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Raisonance\I2C_master_poll.stw
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\STVD\Raisonance\i2c_master_poll.stp
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\inc
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\inc\i2c_master_poll.h
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\inc\stm8l15x.h
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\src
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\src\i2c_master_poll.c
AN3281\Project\STM8L15x\STM8L15x_I2C_master_poll\src\main.c
AN3281\Project\STM8S
AN3281\Project\STM8S\STM8S_I2C_Master_poll
AN3281\Project\STM8S\STM8S_I2C_Master_poll\SI
AN3281\Project\STM8S\STM8S_I2C_Master_poll\SI\STM8S_I2C_Master_poll.IAB
AN3281\Project\STM8S\STM8S_I2C_Master_poll\SI\STM8S_I2C_Master_poll.IAD
AN3281\Project\STM8S\STM8S_I2C_Master_poll\SI\STM8S_I2C_Master_poll.IMB

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