Decrypt Microcontroller PIC18F65K80 Flash Memory can use focus ion beam to unlock pic18f65k80 protection then recover processor pic18f65k80 embedded heximal:

A CCP module can use free-running Timer1 (or Tim- er3), clocked by the internal oscillator block and an external event with a known period (i.e., AC power frequency). The time of the first event is captured in the CCPRxH:CCPRxL registers and is recorded for use later.

When the second event causes a capture, the time of the first event is subtracted from the time of the second event. Since the period of the external event is known, the time difference between events can be calculated. If the measured time is much greater than the calculated time, the internal oscillator block is running too fast.

To compensate, decrement the OSCTUNE register. If the measured time is much less than the calculated time, the internal oscillator block is running too slow by decrypting pic16f1455 microcontroller flash memory. To compensate, increment the OSCTUNE register.

In addition to the FOSC/4 clock output, in certain oscillator modes, the device clock in the PIC18F66K80 family can also be configured to provide a reference clock output signal to a port pin. This feature is avail- able in all oscillator configurations and allows the user to select a greater range of clock submultiples to drive external devices in the application.

This reference clock output is controlled by the REFOCON register (Register 3-4). Setting the ROON bit (REFOCON<7>) makes the clock signal available on the REFO (RC3) pin. The RODIV<3:0> bits enable the selection of 16 different clock divider options.

The ROSSLP and ROSEL bits (REFOCON<5:4>) con- trol the availability of the reference output during Sleep mode. The ROSEL bit determines if the oscillator on OSC1 and OSC2, or the current system clock source, is used for the reference clock output. The ROSSLP bit determines if the reference source is available on RE3 when the device is in Sleep mode.