Extract Microcontroller PIC18F23K20 Locked Heximal after crack mcu pic18f23k20 flash memory, the fuse bit of processsor pic18f23k20 will be attacked to disable the protection;
Clock Source modes can be classified as external or internal.
- External Clock modes rely on external circuitry for the clock source. Examples are: Clock 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 block. The Oscillator block has two internal oscillators: the 16 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<1:0>) bits of the OSCCON register. See Section 2.9 “Clock Switching” for additional information.
The External Clock (EC) mode allows an externally generated logic level as the system clock source by copying mcu pic18f2620 encrypted. When operating in this mode, an external clock source is connected to the OSC1 input and the OSC2 is available for general purpose I/O. Figure 2-2 shows the pin connections for EC mode.
The Oscillator Start-up Timer (OST) is disabled when EC mode is selected. Therefore, there is no delay in operation after a Power-on Reset (POR) or wake-up from Sleep. Because the PIC® MCU design is fully static, stopping the external clock input will have the effect of halting the device while leaving all data intact. Upon restarting the external clock, the device will resume operation as if no time had elapsed.
