AN4266 datasheet(23/76 Pages) STMICROELECTRONICS

Part #	AN4266

Description	Safety application guide for SPC56xL70xx family

PDF	76 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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23 / 76 page

AN4266

Functional safety requirements for application software

Doc ID 024283 Rev 2

23/76

Note:

Rationale: To minimize CCF

Safety Integrity Functions

The safety integrity is achieved by duplicate reads and software comparison by the

processing function (See Figure 3).

Mandatory: The application software must implement the following tests:

●

ETIMER0_SWTEST_REGCRC

●

ETIMER1_SWTEST_REGCRC

●

SIUL_SWTEST_REGCRC

Note:

Rationale: To verify that the configuration of the modules used by this safety function

compare with what is expected

Rationale: To avoid CCF caused by improper configuration of the pads

Mandatory: The application software must implement the test ENCI_SWTEST_CMP, which

compares signals acquired from each channel.

Note:

Rationale: To verify that the two sets of data compare

Figure 3.

Double encoder read input

eTimer_0

ETC[x]

eTimer_1

ETC[y]

Encoder Input Double

Read Configuration

SIUL

EIRQ[x]

EIRQ[y]

= Input Pad

AN4266 Datasheet(PDF) 23 Page - STMicroelectronics