ST10F296 datasheet(226/346 Pages) STMICROELECTRONICS

226 / 346 page

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System reset

ST10F296E

226/346

Figure 82.

Synchronous long hardware reset (EA = 0)

If RPD voltage drops below the threshold voltage (about 2.5 V for 5 V operation) during the reset condition (

RSTIN low),

an asynchronous reset is entered immediately.

The minimum RSTIN low pulse duration must be longer than 500 ns, to guarantee the pulse is not masked by the internal

filter (see Section 21.1: Idle mode on page 240).

Three to eight TCL depending on clock source selection.

20.4

Software reset

A software reset sequence can be triggered at any time by the protected SRST (software

reset) instruction. This instruction can be executed within a program, for example: On a

hardware trap that reveals system failure or to leave bootstrap loader mode.

On execution of the SRST instruction, the internal reset sequence is started. The

microcontroller behavior is the same as for a synchronous short reset, except that only bits

P0.12...P0.8 are latched at the end of the reset sequence, while previously latched, bits

P0.7...P0.2 are cleared (written at 1).

A software reset is always taken as synchronous. There is no influence on software reset

behavior with RPD status. If a bidirectional reset is selected, a software reset event pulls the

RSTIN pin low. This occurs only if RPD is high. If RPD is low, the RSTIN pin is not pulled low

even though a bidirectional reset is selected.

See Figure 83 and Figure 84 which shows unidirectional software reset timing. See

Figure 85, Figure 86, and Figure 87 for bidirectional software reset timing.

P0[15:13]

Not transparent

RSTF

P0[12:2]

Transparent

Not t.

P0[1:0]

Not t.

Not transparent

RST

1024+8 TCL

3..8 TCL(3)

(1) V

RPD > 2.5 V asynchronous reset not entered

200 mA discharge

RPD

RSTOUT

At this time RSTF is sampled low

so it is a long reset

(after filter)

RSTIN

1024+8 TCL

4 TCL(2) 12 TCL

≤500 ns

≥ 50 ns

≤500 ns

≥ 50 ns

≤500 ns

≥ 50 ns

ALE

8 TCL

Not t.

Transparent

3..4 TCL

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