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PIC18LF4620-I Datasheet(PDF) 25 Page - Microchip Technology |
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PIC18LF4620-I Datasheet(HTML) 25 Page - Microchip Technology |
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25 / 412 page  © 2008 Microchip Technology Inc. DS39626E-page 23 PIC18F2525/2620/4525/4620 2.0 OSCILLATOR CONFIGURATIONS 2.1 Oscillator Types PIC18F2525/2620/4525/4620 devices can be operated in ten different oscillator modes. The user can program the Configuration bits, FOSC3:FOSC0, in Configuration Register 1H to select one of these ten modes: 1. LP Low-Power Crystal 2. XT Crystal/Resonator 3. HS High-Speed Crystal/Resonator 4. HSPLL High-Speed Crystal/Resonator with PLL Enabled 5. RC External Resistor/Capacitor with FOSC/4 Output on RA6 6. RCIO External Resistor/Capacitor with I/O on RA6 7. INTIO1 Internal Oscillator with FOSC/4 Output on RA6 and I/O on RA7 8. INTIO2 Internal Oscillator with I/O on RA6 and RA7 9. EC External Clock with FOSC/4 Output 10. ECIO External Clock with I/O on RA6 2.2 Crystal Oscillator/Ceramic Resonators In XT, LP, HS or HSPLL Oscillator modes, a crystal or ceramic resonator is connected to the OSC1 and OSC2 pins to establish oscillation. Figure 2-1 shows the pin connections. The oscillator design requires the use of a parallel cut crystal. FIGURE 2-1: CRYSTAL/CERAMIC RESONATOR OPERATION (XT, LP, HS OR HSPLL CONFIGURATION) TABLE 2-1: CAPACITOR SELECTION FOR CERAMIC RESONATORS Note: Use of a series cut crystal may give a fre- quency out of the crystal manufacturer’s specifications. Typical Capacitor Values Used: Mode Freq OSC1 OSC2 XT 3.58 MHz 4.19 MHz 4 MHz 4 MHz 15 pF 15 pF 30 pF 50 pF 15 pF 15 pF 30 pF 50 pF Capacitor values are for design guidance only. Different capacitor values may be required to produce acceptable oscillator operation. The user should test the performance of the oscillator over the expected VDD and temperature range for the application. See the notes following Table 2-2 for additional information. Note 1: See Table 2-1 and Table 2-2 for initial values of C1 and C2. 2: A series resistor (RS) may be required for AT strip cut crystals. 3: RF varies with the oscillator mode chosen. C1(1) C2(1) XTAL OSC2 OSC1 RF (3) Sleep To Logic PIC18FXXXX RS(2) Internal |
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