Reset pin working(8051)

in 8051 pin number 9 is reset's an input pin upon applying a high pulse of two machine cycle, the control will reset(erase all register holding data) and set program counter to 00h

as you can see holding reset pin for at least two machine cycle before it is allowed to go low. capacitor value is selected such that when power is turned on capacitor should get charge at a rate that reset pin remains high for two machine cycle and also current will flow through led connected to ground will glow .when capacitor charge fully it blocks the the dc current that is when you momentarily press the switch reset pin will set at 5v for two machine cycle and it goes low.




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