Dear Shaotian,
please refer to the section 11.5 in an AN12776 attached. To set the FXLS93220 to asynchronous mode, you need to change the ASYNC bit to 1 in the PSI5_CFG register.
JozefKozon_0-1704358441555.png
JozefKozon_1-1704358493280.png
With Best Regards,
Jozef