ST10F296 datasheet(229/346 Pages) STMICROELECTRONICS

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ST10F296E

System reset

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20.6

Bidirectional reset

The RSTOUT pin is driven active (low level) at the beginning of any reset sequence

(synchronous/asynchronous hardware, software, and watchdog timer resets). It stays active

low after the end of the initialization routine and until the protected EINIT instruction (End of

Initialization) is completed.

The bidirectional reset function is useful when external devices require a reset signal, but, it

cannot be connected to the RSTOUT pin, because the RSTOUT signal continues during

initialization. In this case, the external memory can run the initialization routine before the

execution of the EINIT instruction.

The bidirectional reset function is enabled by setting the BDRSTEN bit in the SYSCON

is completed.

Once enabled, the open-drain of the RSTIN pin is activated, pulling the reset signal down for

the duration of the internal reset sequence (synchronous/asynchronous hardware,

synchronous software, and synchronous watchdog timer resets). At the end of the internal

reset sequence the pull down is released and:

●

If RSTF is sampled low (8 TCL periods after the internal reset sequence completion,

see Figure 79 and Figure 80) after a short synchronous bidirectional hardware reset,

the short reset becomes a long reset. On the contrary, if RSTF is sampled high, the

device simply exits reset state.

●

After a software or watchdog bidirectional reset, the device exits from reset. If RSTF

remains low for at least 4 TCL periods after exiting reset (minimum time to recognize a

short hardware reset, see Figure 85 and Figure 86), the software or watchdog reset

become a short hardware reset. On the contrary, if RSTF remains low for less than 4

TCL, the device exits the reset state.

The bidirectional reset is not effective when RPD is held low or when a software or

watchdog reset event occurs. On the contrary, if a software or watchdog bidirectional reset

event is active and RPD becomes low, the RSTIN pin is immediately released, while the

internal reset sequence is completed regardless of the RPD status change (1024 TCL).

Note:

The bidirectional reset function is disabled by any reset sequence (when the BDRSTEN bit

of the SYSCON register is cleared). To be activated again, it must be enabled during the

initialization routine.

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