Recover Winbond W78ERD2 Chip Eeprom Data
Clock and crystal oscillator are all playing the important roles in Recover Winbond W78ERD2 Chip Eeprom Data.
The W78ERD2 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 by default. This makes the W78ERD2 relatively insensitive to duty cycle variations in the clock.
Crystal Oscillator
The W78ERD2 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, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC bias when the crystal frequency is above 24 MHz.
External Clock
An external clock 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. As a result, the external clock signal should have an input one level of greater than 3.5 volts.
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