ST STM32L4 5 Series Reference Manual page 324

Peripherals interconnect matrix
10 Peripherals interconnect matrix
10.1 Introduction
Several peripherals have direct connections between them.
This allows autonomous communication and or synchronization between peripherals,
saving CPU resources thus power supply consumption.
In addition, these hardware connections remove software latency and allow design of
predictable system.
Depending on peripherals, these interconnections can operate in Run, Sleep, Low-power
run and sleep, Stop 0, Stop 1 and Stop 2 modes.
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