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PIC18F020T Datasheet(PDF) 9 Page - Microchip Technology |
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PIC18F020T Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 176 page  2001 Microchip Technology Inc. Preliminary DS41142A-page 7 PIC18F010/020 2.0 OSCILLATOR CONFIGURATIONS 2.1 Oscillator Types The PIC18F010/020 can be operated in eight different oscillator modes. Programming these modes is done via the CONFIG1H register (FOSC2, FOSC1, and FOSC0). 1. LP Low Power Crystal 2. XT Crystal/Resonator 3. HS High Speed Crystal/Resonator 4. EC External Clock 5. RC External Resistor/Capacitor 6. RCIO External Resistor/Capacitor with I/O pin enabled 7. INTOSC Precision Internal Oscillator 8. INTOSCIO Precision Internal Oscillator with I/O pin enabled 2.2 Crystal Oscillator/Ceramic Resonators In XT, LP, or HS oscillator modes, a crystal or ceramic resonator is connected to the RB5/OSC1 and RB4/ OSC2 pins to establish oscillation. Figure 2-1 shows the pin connections. An external clock source may also be connected to the OSC1 pin in these modes, as shown in Figure 2-2. The PIC18F010/020 oscillator design requires the use of a parallel cut crystal. FIGURE 2-1: CRYSTAL/CERAMIC RESONATOR OPERATION (HS, XT OR LP OSC CONFIGURATION) FIGURE 2-2: EXTERNAL CLOCK INPUT OPERATION (HS, XT OR LP OSC CONFIGURATION) Note: Use of a series cut crystal may give a fre- quency out of the crystal manufacturers specifications. Note 1: See Table 2-1 and Table 2-2 for recom- mended values of C1 and C2. 2: A series resistor (RS) may be required for AT strip cut crystals. 3: RF varies with the crystal chosen. C1(1) C2(1) XTAL OSC2 OSC1 RF(3) SLEEP To logic RS(2) internal RB5/OSC1 RB4/OSC2 Open Clock from ext. system PIC18F010/020 |
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