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9.3.3. AHB-AP clocks and resets

The AHB-AP has two clock domains:

DAPCLK

Drives the DAP bus interface and access control for register read and writes. DAPCLK must be driven by a constant clock. When started, it must not be stopped or altered while the DAP is in use.

DAPCLK can be connected to HCLK or can be asynchronous to HCLK, if there are other APs in the SoC that cannot operate at full HCLK.

HCLK

AHB clock domain driving AHB interface.

DAPRESETn

Initializes the state of all registers in the AHB-AP.

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