AHB:
AHB:Advanced High-performance Bus
The peripherals connected by the AHB and APB buses are different. The AHB bus connects high-speed peripherals to high-speed peripherals, while low-speed peripherals are interconnected through the APB bus.
APB:
APB (Advanced Peripheral Bus) means peripheral bus. This bus protocol is one of the AMBA bus structures proposed by ARM and has almost become a standard on-chip bus structure.
FSMC:
Flexible Static Memory Controller
STM32 system structure:
STM32 clock tree:
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