The first step to get Protected Winbond Microprocessor W78E65 Reverse Engineering to get its embedded firmware include the content from both eeprom and flash is to figure out the clock frequency, as a result of that, it is critical to understand the operational procedures of Microprocessor W78E65’s clock.

The W78E51B is designed to be used with either a crystal oscillator or an external clock. Internally,  the clock is divided by two before it is used.

This makes the W78E51B relatively insensitive to duty cycle variations in the clock. The W78E51B incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be connected across pins XTAL1 and XTAL2.

In addition, a load capacitor must be connected from each pin to ground. An external clock source should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The XTAL1 input is a CMOS-type input, as required by the crystal oscillator in order to finalize the evaluation of Protected Winbond Microprocessor W78E65 Reverse Engineering.

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