Extract MCU PIC12F675 Code from its memory and copy the firmware to blank Microcontroller PIC12F675 for a perfect Microprocessor cloning, the MCU breaking will help to turn the status of MCU from locked to unlocked;

The TRISB register controls the PORTB pin output drivers, even when they are being used as analog inputs. The user should ensure the bits in the TRISB register are maintained set when using them as analog inputs. I/O pins configured as analog input always read ‘0’ when IC ATmega88V code extraction.

PORTB pins RB<7:4> on the device family device have an interrupt-on-change option and a weak pull-up option. The following three sections describe these PORTB pin functions. Each of the PORTB pins has an individually configurable internal weak pull-up. Control bits WPUB<7:4> enable or disable each pull-up (see Register 4-9).

Each weak pull up is automatically turned off when the port pin is configured as an output. All pull-ups are disabled on a Power-on Reset by the RABPU bit of the OPTION register.

Four of the PORTB pins are individually configurable as an interrupt-on-change pin. Control bits IOCB<7:4> enable or disable the interrupt function for each pin. Refer to Register 4-10. The interrupt-on-change feature is disabled on a Power-on Reset after mcu ATmega168 code extraction.

For enabled interrupt-on-change pins, the present value is compared with the old value latched on the last read of PORTB to determine which bits have changed or mismatch the old value.

The ‘mismatch’ outputs are OR’d together to set the PORTB Change Interrupt flag bit (RABIF) in the INTCON register (Register 2-3). This interrupt can wake the device from Sleep. The user,in the Interrupt Service Routine, clears the interrupt if extract microcontroller ATmega168A eeprom:

Any read or write of PORTB. This will end the mismatch condition. Clear the flag bit RABIF.

A mismatch condition will continue to set flag bit RABIF. Reading or writing PORTB will end the mismatch condition and allow flag bit RABIF to be cleared. The latch holding the last read value is not affected by a MCLR nor Brown-out Reset.

After these Resets, the RABIF flag will continue to be set if a mismatch is present. If a change on the I/O pin should occur when the read operation is being executed (start of the Q2 cycle), then the RABIF interrupt flag may not get set. Furthermore, since a read or write on a port affects all bits of that port, care must be taken when using multiple pins in Interrupt-on-Change mode. Changes on one pin may not be seen while servicing changes on another pin.