About "Interface Clock Enable" and "Peripheral Clock Enable" on STM32 APB Bus-EEWORLD

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Today I looked at the RTC clock on <> and found that he did not enable the BKP clock on APB1, but he could read the contents of the BKP register. I was very puzzled, and I looked again and found that there are two types of clock enable on the APB bus, one is the interface clock and the other is the peripheral clock.

After carefully checking the clock tree, I found that the peripherals represented as interface clocks in the APB peripheral clock enable register already have their own clocks. Experiments have proved that all peripherals that do not need to be enabled on APB and have their own clocks (that is, peripherals whose interface clocks are represented in a certain bit of APBxENR) can read the contents of the registers of such peripherals without enabling the interface clock!

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