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Table 21

Watchdog state machine

Watchdog state

Description

WD inactive

In the "WD inactive" state the watchdog is waiting for the first WD command after a

reset.

The configuration of the watchdog was set by the prior occurred reset to the

default state after a reset according to the definition in Chapter 4.1.

Decrement WD error

counter after reset

In this state the error counter is decremented by 1. This state is active only once

after a reset.

Increment WD error

counter after reset

In this state the error counter is incremented by 1. This state is active only once

after a reset.

Start watchdog period

In this state the watchdog period is started with the closed window and the setup

according to the watchdog configuration.

Wait for WD command

In this state, the watchdog period is active until a watchdog command is received

(via SPI) or the watchdog period is expired.

Timing and command

check

In this state, the timing and the command are checked. The watchdog diagnosis

error bits WDTO, WDCE and WDERR are set according to the status of the watchdog

period and the watchdog check command bit WDC.

Increment WD error

counter

In this state the WD error counter is incremented by 1.

Decrement WD error

counter

In this state the WD error counter is decremented by 1.

Table 22

Watchdog state machine transitions

State

Event or condition

for transition to

target state

Target state

Notes

Reset acc. Operation

states

WD inactive

see Chapter 4.1

WD inactive

WD command:

WDC=10

Decrement WD error

counter after reset

WD inactive

WD command:

WDC≠10

Increment WD error

counter after reset

Decrement WD error

counter after reset

not event triggered

Start watchdog period no condition or event needed for

transition, only decrement must be

performed for automatic transition

Increment WD error

counter after reset

not event triggered

Start watchdog period no condition or event needed for

transition, only increment must be

performed for automatic transition

Start watchdog period not event triggered

Wait for WD check

command

no condition or event needed for

transition, only watchdog period

started for automatic transition

TLE8082ES

Small engine management IC

Watchdog

Datasheet

Rev. 1.0

2021-03-23

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