In 8051 microprocessor we have a pin named RESET which is pin no 9.RESET is an active High input for 8051.When RESET is set to High, 8051 microprocessor goes back to the power on state.
The 8051 microprocessor is reset by holding the RESET high for at least two machine cycles and then returning it low.This can be done by holding the switch in the circuit shown below.
- First the capacitor is charged fully by the power supply.
- After when the switch is pressed the charged is discharged and the reset is maintained High.
- Then 8051 microprocessor goes back to power on state.
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| simple reset circuit |
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