ST10F271 datasheet(90/173 Pages) STMICROELECTRONICS

90 / 173 page

System reset

ST10F271

90/173

Refer to next Figures 25 and 26 for unidirectional SW reset timing, and to Figures 27, 28 and

29 for bidirectional.

20.5

Watchdog timer reset

When the watchdog timer is not disabled during the initialization, or serviced regularly

during program execution, it will overflow and trigger the reset sequence.

Unlike hardware and software resets, the watchdog reset completes a running external bus

cycle if this bus cycle either does not use READY, or if READY is sampled active (low) after

the programmed wait states.

When READY is sampled inactive (high) after the programmed wait states the running

external bus cycle is aborted. Then the internal reset sequence is started.

Bit P0.12...P0.8 are latched at the end of the reset sequence and bit P0.7...P0.2 are cleared

(that is written at ‘1’).

A Watchdog reset is always taken as synchronous: there is no influence on Watchdog Reset

behavior with RPD status. In case Bidirectional Reset is selected, a Watchdog Reset event

pulls RSTIN pin low: this occurs only if RPD is high; if RPD is low, RSTIN pin is not pulled

low even though Bidirectional Reset is selected.

Refer to next Figures 25 and 26 for unidirectional SW reset timing, and to Figures 27, 28 and

29 for bidirectional.

Figure 25.

SW / WDT unidirectional RESET (EA = 1)

P0[7:2]

not transparent

P0[12:8]

transparent

not t.

P0[1:0]

not t.

not transparent

RST

1024 TCL

RSTOUT

RSTIN

IBUS-CS

7 TCL

P0[15:13]

not transparent

FLARST

≤ 1 ms

(Internal)

≤ 2 TCL

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