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hard reset :-- it occurs due to power on off in this case there may be chances of data corruption and the controller is not able to save any important data
soft reset :-- it is done through software or it is known to the software that the system will restart now so we can take care of all the variables we want to store and dont loose the data
A 'soft reset' is best done by using the watch dog timer (if the MCU has one) to do a real hard reset. I say this because simply forcing the program to start at address 0000 does not clear interrupt flags etc. For example if RI is set and not cleared it can cause problems after your soft reset. If you do choose to do a soft reset make sure that you reset all registers that need to be reset and then force a jump to 0000 - this can be done by calling a function that pushes the 0000 return address onto the stack
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