STFPC311 datasheet(11/39 Pages) STMICROELECTRONICS

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STFPC311

3 Initialization

11/39

3.6.3

Watchdog timer operation during standby

●

When a hot-key signal is detected either from the front panel or remote control during

standby, the STBY de-asserts.

●

The de-assertion of the STBY triggers the watchdog timer.

●

The timer value is the programmed value that is set by the user (1s-15s). If the user did not

change the value before entering standby, then it remains 10s.

●

Also note: that The watchdog timer is off when the STFPC311 is in the standby mode to

save power.

Figure 5.

Standby condition

The watchdog timer is triggered by a de-assertion of the STBY signal or by the internal

Power-on Reset signal. It is not affected by the STB pin.

ST BY

3 a) S tand by C o ndition (N orm al beha vior )

H ot key co m m a nd fro m IR

o r K ey pa d for w ake u p

RE ADY

MU T E

ST BY

3b ) S tand by C o ndition (A bnorm al beha vior, processor is not respondin g)

H ot key com m an d fro m IR

or K e y pad for w a ke up

RE A D Y

MU T E

R E A D Y co ntinu es to rem a in lo w

Signa ls ST BY after

W D G count is o ver

W D G tim er trigge rs

R E A D Y asserts w ithin pro gra m m e d tim er valu e (1 s-15s)

WD G tim er

triggers

ST BY

3 a) S tand by C o ndition (N orm al beha vior )

H ot key co m m a nd fro m IR

o r K ey pa d for w ake u p

RE ADY

MU T E

ST BY

3b ) S tand by C o ndition (A bnorm al beha vior, processor is not respondin g)

H ot key com m an d fro m IR

or K e y pad for w a ke up

RE A D Y

MU T E

R E A D Y co ntinu es to rem a in lo w

Signa ls ST BY after

W D G count is o ver

W D G tim er trigge rs

R E A D Y asserts w ithin pro gra m m e d tim er valu e (1 s-15s)

WD G tim er

triggers

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