STM32H5 I3C SDR READ issue

[wulin]

Hello, when I was using the STM32H563 I3C, I found that when configured with VDDIO2 = 1.2V and a frequency of 12.5MHz, the data read in SDR mode would be misaligned. The waveform received on the SDA line was 0xF9, but the MCU received 0x7C. After I increased the VDDIO voltage to 1.5V, the data read was correct. And I tried VDDIO2=1.2V, frequency =6.25Mhz, data was correct, too.

 

 

[mƎALLEm]

Hello @wulin and welcome to the community,

It could be something related to the HSLV configuration. Refer to the datasheet / and tables:

Output timing characteristics VDDIO2 1.2 V range (HSLV OFF)

Output timing characteristics VDDIO2 1.2 V (HSLV ON)

Did you activate the HSLV?

 

 

[wulin]

Hello, @mƎALLEm , thank you for your reply.

HSLV was disabled in my previous setting. But I tried to set HSLV ON, the result was still the same as before.