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89c52 crystal frequency

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gondu said:
what is the maximum crystal frequency that can be compatibal with 89c52

look at the markings on the chip.
if its an 89C52-12 then the max safe freq is 12MHz.
if its an 89C52-20 then the max safe freq is 20MHz.
if its an 89C52-24 then the max safe freq is 24MHz.

also refer to the datasheet, near the back.
 
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