I2C Interrupt after 8th Bit

[Joern]

Hi

i have to set an address for a I2C slave (MCP 4728) connected to my MK22FN1M0...

Therefore i have change the state of another pin between bit 8 and bit 9.

My idea was to use the TCF interrupt with FACK enabled, because datasheet says:

"48.4.6.1 Byte transfer interrupt
The Transfer Complete Flag (TCF) bit is set at the falling edge of the ninth clock to
indicate the completion of a byte and acknowledgement transfer. When FACK is enabled,
TCF is then set at the falling edge of eighth clock to indicate the completion of byte."

I get the Interrupt at the 9th bit, but i cannot move the interrupt to the 8th bit.

Am i missing something?

Is FACK not changing TCF behaviour if not in SMBus receiver mode?

The behaviour i need is this:

LDAC Pin is on a separate I2C independent GPIO

[Joern]

Hi Leo,

thanks for the reply!

I will check if i can switch to SMBus mode for that period.

Have a nice one!

[_Leo_]

You're welcome, any other questions feel free to continue using our technical support service.

[_Leo_]

Hi,

Thank you so much for your interest in our products and for using our community.

You are correct! FACK does not change TCF behavior if not in SMBus mode.

Have a nice day!