GPIO output is running slower than clock frequency

Hi

I'm trying out stm32h743 now, and try to make output signal from GPIO.

I've set same frequency on F429 & H743 with same code. However, The the signal much slower(longer) in H743.

• F429 400ns
• H743 4000ns

(well... my purpose is to shorten the length of the signal as much as possible)

Even if I maximized frequency of H743, the signal of H743 is still much slower(3200ns) than F429.

Could anybody help me to figure out the reason?

Thanks in advance.