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Read Chip PIC18F2610 Firmware
Read Chip PIC18F2610 Firmware from microcontroller’s flash and eeprom memory, program inside the flash and data from eeprom will be exactly the same as original PIC18F2610 which will provide the same functions when rewrite the firmware to other blank MCU for cloning;
Read Chip PIC18F2610 Firmware from microcontroller’s flash and eeprom memory, program inside the flash and data from eeprom will be exactly the same as original PIC18F2610 which will provide the same functions when rewrite the firmware to other blank Microcontroller for copying
The EC and ECIO Oscillator modes require an external clock source to be connected to the OSC1 pin. There is no oscillator start-up time required after a Power-on Reset or after an exit from Sleep mode.
In the EC Oscillator mode, the oscillator frequency divided by 4 is available on the OSC2 pin. This signal may be used for test purposes or to synchronize other logic. Figure 2-3 shows the pin connections for the EC Oscillator mode.
For timing insensitive applications, the “RC” and “RCIO” device options offer additional cost savings. The actual oscillator frequency is a function of several factors:
· supply voltage
· values of the external resistor (REXT) and capacitor (CEXT)
A Phase Locked Loop (PLL) circuit is provided as an option for users who wish to use a lower frequency oscillator circuit or to clock the device up to its highest rated frequency from a crystal oscillator. This may be useful for customers who are concerned with EMI due to high-frequency crystals or users who require higher clock speeds from an internal oscillator.
· operating temperature
2.5.1 HSPLL OSCILLATOR MODE
Given the same device, operating voltage and temperature and component values, there will also be unit-to-unit frequency variations. These are due to factors such as:
· normal manufacturing variation
· difference in lead frame capacitance between package types (especially for low CEXT values)
· variations within the tolerance of limits of REXT and CEXT
The HSPLL mode makes use of the HS mode oscillator for frequencies up to 10 MHz. A PLL then multiplies the oscillator output frequency by 4 to produce an internal clock frequency up to 40 MHz. The PLLEN bit is not available in this oscillator mode.
The PLL is only available to the crystal oscillator when the FOSC3:FOSC0 configuration bits are programmed for HSPLL mode (= 0110).
In the RC Oscillator mode, the oscillator frequency divided by 4 is available on the OSC2 pin. This signal may be used for test purposes or to synchronize other logic. Figure 2-5 shows how the R/C combination is connected.
The RCIO Oscillator mode (Figure 2-6) functions like the RC mode, except that the OSC2 pin becomes an additional general purpose I/O pin. The I/O pin becomes bit 6 of PORTA (RA6).
The PIC18F2X1X/4X1X devices include an internal oscillator block which generates two different clock signals; either can be used as the microcontroller’s clock source. This may eliminate the need for external oscillator circuits on the OSC1 and/or OSC2 pins.
The main output (INTOSC) is an 8 MHz clock source, which can be used to directly drive the device clock. It also drives a postscaler, which can provide a range of clock frequencies from 31 kHz to 4 MHz. The INTOSC output is enabled when a clock frequency from 125 kHz to 8 MHz is selected.
The other clock source is the internal RC oscillator (INTRC), which provides a nominal 31 kHz output. INTRC is enabled if it is selected as the device clock source; it is also enabled automatically when any of the following are enabled:
Power-up Timer
Fail-Safe Clock Monitor
Watchdog Timer
· Two-Speed Start-up
These features are discussed in greater detail in Section 22.0 “Special Features of the CPU”.
The clock source frequency (INTOSC direct, INTRC direct or INTOSC postscaler) is selected by configuring the IRCF bits of the OSCCON register (page 30).
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