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Update layer_by_layer.adoc to clarify PAC limitations #4259

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Update layer_by_layer.adoc to clarify PAC limitations #4259

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2 changes: 1 addition & 1 deletion docs/pages/layer_by_layer.adoc
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Expand Up @@ -8,7 +8,7 @@ The application we'll write is a simple 'push button, blink led' application, wh

== PAC version

The PAC is the lowest API for accessing peripherals and registers, if you don't count reading/writing directly to memory addresses. It provides distinct types to make accessing peripheral registers easier, but it does not prevent you from writing unsafe code.
The PAC is the lowest API for accessing peripherals and registers, if you don't count reading/writing directly to memory addresses. It provides distinct types to make accessing peripheral registers easier, but it does little to prevent you from configuring or coordinating those registers incorrectly.

Writing an application using the PAC directly is therefore not recommended, but if the functionality you want to use is not exposed in the upper layers, that's what you need to use.

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