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Single clock for 2, AT89C2051 micro.

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electronicus

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How can drive 2 micro AT89C2051, whit a single 11,0259 MHz clock ?.

Thanks for help!
 

silvio

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Just fit the quartz crystal and appropiate capacitors on pins 4 and 5 and link pin 4 of the first micro to pin 5 of the second micro.
Pin 4 of the second micro should be left unconnected.
As long as the swing voltage on pin 5 meat the specification of min 0,7Vcc for VIH and max 0,2Vcc for VIL everything is OK.
 

IanP

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You can try Silvio's option of connecting the second 2051 directly to the first one, but I would consider manufacturer's recommendation to connect external clock source to 80C51-derivatives through a buffer gate .. see picture below ..
Regards,
IanP
 

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