Hi @Anburaja ,
To the MCU, no 3GHz, the highest is 1Ghz.
If you need higher speed, you may need to check the MPU, not the MCU.
BTW, do you mean your chip spi and the parallel IO is up to 3Ghz, I don't think that is possible.
Maybe you need to double check your requirement at first.
Best Regards,
Kerry