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Crack Microchip IC PIC16F677 flash memory and extract Firmware out, reprogramme the code into blank MCU PIC16F677, the status of original microcontroller PIC16F677 will be turned from locked to unlocked one by microprocessor breaking technique;

Crack Microchip IC PIC16F677 flash memory and extract Firmware out, reprogramme the code into blank MCU PIC16F677, the status of original microcontroller PIC16F677 will be turned from locked to unlocked one by microprocessor breaking technique

Clock Source modes can be classified as external or internal

· External Clock modes rely on external circuitry for the clock source. Examples are: Oscillator modules (EC mode), quartz crystal resonators or ceramic resonators (LP, XT and HS modes) and Resistor-Capacitor (RC) mode circuits.

· Internal clock sources are contained internally within the Oscillator module. The Oscillator module has two internal oscillators: the 8 MHz High-Frequency Internal Oscillator (HFINTOSC) and the 31 kHz Low-Frequency Internal Oscillator (LFINTOSC).

The system clock can be selected between external or internal clock sources via the System Clock Select (SCS) bit of the OSCCON register after Freescale Microcontroller S9S12G128F firmware recoverying.

If the Oscillator module is configured for LP, XT or HS modes, the Oscillator Start-up Timer (OST) counts 1024 oscillations from OSC1. This occurs following a Power-on Reset (POR) and when the Power-up Timer (PWRT) has expired (if configured), or a wake-up from Sleep. During this time, the program counter does not increment and program execution is suspended. The OST ensures that the oscillator circuit, using a quartz crystal resonator or ceramic resonator, has started and is providing a stable system clock to the Oscillator module. When switching between clock sources, a delay is required to allow the new clock to stabilize.

These oscillator delays are shown in Table 3-1. In order to minimize latency between external oscillator start-up and code execution, the Two-Speed Clock Start-up mode can be selected t;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA’>(SCS) bit of the OSCCON register.