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Locked Microprocessor ATMEGA1280 Firmware Unlocking can help engineer readout eeprom and flash content from ATMEGA1280 IC, and fuse bit of ATMEGA1280 MCU will be broken;

Three I/O memory address locations are allocated for each port, one each for the Data Register – PORTx, Data Direction Register – DDRx, and the Port Input Pins – PINx.

The Port Input Pins I/O location is read only, while the Data Register and the Data Direction Register are read/write in the process of recovering atmega64 mcu flash embedded heximal. In addition, the Pull-up Disable – PUD bit in SFIOR disables the pull-up function for all pins in all ports when set.

Using the I/O port as General Digital I/O is described in “Ports as General Digital I/O” on page 57. Most port pins are multiplexed with alternate functions for the peripheral features on the device.

How each alternate function interferes with the port pin is described in “Alternate Port Functions” on page 61 when copy atmega16l locked microprocessor memory code. Refer to the individual module sections for a full description of the alternate functions.

Note that enabling the alternate function of some of the port pins does not affect the use of the other pins in the port as general digital I/O.