Regardiing 8051 reset circuit

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tarun embedded lover

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If I connect 22uf capacitor and 10k resistance in place of 10uf and 8.2k resistance it works fine can any body explain.
 

What is your question? Why does the reset circuit work with short or long time constants?
 


Both R-C options yield very close result at the same magnitude order, and complies to timing requirement stated for RST pin at most 51 cores ( e.g. ) .


+++
 
AT89C51 or AT89S52
Click to expand...
You'll find in the datasheet that CMOS 8051 (all recent types) can work without a pulldown resistor and only 1 µF capacitor. In other words, any RC combination that achieves a reasonable delay will be fine.
 

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