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how to save passward in 80c51 for door relay

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kashif_ramzan

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how to save passward in 80c51 for door relay plz.. help me
and show lcd 4*20 by using 4
4*3key pad
 

how to save passward in 80c51 for door relay plz.. help me

A small external EEProm (eg. with I2C bus) will be the best alternative ..
Once the code is stored there it will be safe even if the power is interrupted ..

IanP
:D
 

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