STM32H503 DWT problem with PRODUCT STATE == 72

[Mike1992]

Friends, hello, I encountered a problem with starting DWT with PRODUСT STATE = 72;
I measure the time between pulses (white beam of the logic analyzer) by the EXTI5 interrupt input (falling edge of the signal), TIME_LONG_SENS = DWT->CYCCNT / (SystemCoreClock / 1000000); and then reset the counter DWT->CYCCNT = 0U; I measured the number of pulses on the generator and the number of interrupts on the input, they are equal. Then after a certain delay I control the microcontroller output to send a pulse (red and yellow beams of the logic analyzer).
The problem is that after zeroing DWT in the PRODUСT STATE = 72 state,

One output pulse is skipped.

it does not always start and upon arrival of the next interrupt, the DWT->CYCCNT value is zero, and accordingly, the measured time is also zero.
If I set PRODUСT STATE = ED,

then this problem does not occur and the same code works correctly.
Please tell me what my problem is and how to solve it?

[Jocelyn RICARD · Accepted solution]

Hello @Mike1992 ,

the DWT as well as all debug peripherals are not available when device is in CLOSED state..

You can use either Systick timer or any timer provided in the device

Best regards

Jocelyn