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If the WDT is enabled with a small prescale value, a decrease in clock speed allows a WDT time-out to occur and a subsequent device Reset. For this reason, Fail-Safe Clock events also reset the WDT and postscaler, allowing it to start timing from when execution speed was changed and decreasing the likelihood of an erroneous time-out.
The Fail-Safe condition is terminated by either a device Reset, or by entering a power managed mode. On Reset, the controller starts the primary clock source specified in Configuration Register 1H (with any required start-up delays that are required for the oscillator mode, such as OST or PLL timer).
The INTOSC multiplexer provides the system clock until the primary clock source becomes ready (similar to a Two- Speed Start-up). The clock system source is then switched to the primary clock (indicated by the OSTS bit in the OSCCON register becoming set). The Fail- Safe Clock Monitor then resumes monitoring the peripheral clock.