In SX Microcontrollers, SX/B Compiler and SX-Key Tool, peterverkaik wrote:

Thanks Guenther,
I didn't think of the wdt. 
Then I only need to connect the reset button to the SX28 MCLR input.
The SX28 I/O pin will connect to the stamp reset pin, no cap needed.
The SX28 status register allows me to distinguish between a powerup/mclr reset
and a wdt reset, so I could count the number of wdt resets during which
no communication is estabished between the SX28 and the stamp and if that
number exceeds a certain value, I could signal a buzzer, indicating hardware
failure (one stamp pin also connects to that buzzer in case the SX28 fails).

regards peter

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