Dave Van Horn wrote:

>Dan Michaels <oricom@LYNX.SNI.NET> wrote:
>>Good question. In the Electronic Design article someone
>>else mentioned, they use an external oscillator chip to
>>drive OSC1 at 32 Khz, by overriding the normal xtal, X1.
>>
>>They have a series resistor, named Rsafe = 150 ohms, in
>>the line to protect X1.
>>
>>Why would the Xtal blow if X1 is shorted to GND or grounded ? I'd rather
>>expect the drivers in the PIC or in the external chip to be temporarily
>>overloaded with a quantity of energy that is unbelievably small (The
>>energy stored in the Xtal at maximum deflexion during one half of an
>>oscillation cycle - assuming that the switching occurs then). Am I missing
>>something ?
>
>There's no way you're going to harm an AT cut xtal this way.
>A fork resonator for 32 kHz might be different.
>

Who knew?

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