RM0016 datasheet(76/467 Pages) STMICROELECTRONICS

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Reset (RST)

RM0016

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DocID14587 Rev 14

8.3.3

Software reset

The application software can trigger reset by clearing bit T6 in the WWDG_CR register.

Refer to Section 15: Window watchdog (WWDG).

8.3.4

SWIM reset

An external device connected to the SWIM interface can request the SWIM block to

generate an MCU reset.

8.3.5

Illegal opcode reset

In order to provide enhanced robustness to the device against unexpected behavior, a

system of illegal opcode detection is implemented. If a code to be executed does not

correspond to any opcode or prebyte value, a reset is generated. This, combined with the

Watchdog, allows recovery from an unexpected fault or interference.

Note:

A valid prebyte associated with a valid opcode forming an unauthorized combination does

not generate a reset.

8.3.6

EMC reset

To protect the application against spurious write access or system hang-up, possibly caused

by electromagnetic disturbance, the most critical registers are implemented as two bitfields

that must contain complementary values. Mismatches are automatically detected by this

mechanism, triggering an EMC reset and allowing the application to cleanly recover normal

operations.

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