AN3324 datasheet(14/37 Pages) STMICROELECTRONICS

Part #	AN3324

Description	Implementing power-on self tests

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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14 / 37 page

AN3324

Module software requirements for non applicative peripherals

Doc ID 18311 Rev 2

14/37

The only exception to this rule is when the CMU monitors a PLL that is not used or is used

for non safety critical modules only.

In this case, error masking and limited internal reaction can be tolerated. External reaction

of the FCCU is always enabled and it can not be disabled.

User has to verify that no Critical Fault (CF) or Non Critical Fault (NCF) are present after the

boot.

Note:

The application has to configure the FCCU to enable all reactions related to faults of

peripherals used by the application safety function (see Figure 4: FCCU configuration flow).

Figure 4.

FCCU configuration flow

Configure Time-Out

Configure Critical Faults

Reaction

Begin

Enter Config State

Configure Non Critical

Faults Reaction

Configure Output

Protocol

Enable FCCU Irq with

proper priority

Set Normal State

End

AN3324 Datasheet(PDF) 14 Page - STMicroelectronics