Microprocessor
After RESET 8255 will be in

 mode 0; all ports are input
 mode 0; all ports are output
 mode 2
 unchanged condition

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Microprocessor
The interrupt facility is provided in microprocessor to

 stop the microprocessor when it starts malfunctioning
 keep a control on the working of the microprocessor
 change the sequence of the instructions being executed
 stop the microprocessor when desired

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