Recover Microcontroller ATmega324V Data from program memory and data memory, unlock MCU ATmega324V security fuse by focus ion beam, then extract code from microprocessor ATmega324V;

Pins XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured for use as an On-Microcontroller Oscillator, as shown in Figure 22. Either a quartz crystal or a ceramic resonator may be used. This Crystal Oscillator is a full swing oscillator, with rail-to-rail swing on the XTAL2 output.

This is useful for driving other clock inputs and in noisy environments. The current consumption is higher than the “Low Power Crystal Oscillator”.
Note that the Full Swing Crystal Oscillator will only operate for Vcc = 2.7 – 5.5 volts. C1 and C2 should always be equal for both crystals and resonators. The optimal value of the capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the electromagnetic noise of the environment.
Some initial guidelines for choosing capacitors for use with crystals are given in Table 12. For ceramic resonators, the capacitor values given by the manufacturer should be used.
The frequency ranges are preliminary values. Actual values are TBD.
If 8 MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8 Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured that the resulting divided clock meets the frequency specification of the device when chip pic16f870 program copying.
These options should only be used when not operating close to the maximum frequency of the device, and only if frequency stability at start-up is not important for the application. These options are not suitable for crystals.
These options are intended for use with ceramic resonators and will ensure frequency stability at start-up. They can also be used with crystals when not operating close to the maximum frequency of the device, and if frequency stability at start-up is not important for the application.
The frequency ranges are preliminary values. Actual values are TBD.
This option should not be used with crystals, only with ceramic resonators.
If 8 MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8 Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured that the resulting divided clock meets the frequency specification of the device.

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