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PIC16C58B-20I/SS 数据表(PDF) 26 Page - Microchip Technology |
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PIC16C58B-20I/SS 数据表(HTML) 26 Page - Microchip Technology |
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26 / 84 page  PIC16CR54C DS40191A-page 26 Preliminary © 1998 Microchip Technology Inc. 7.2 Oscillator Configurations 7.2.1 OSCILLATOR TYPES PIC16CR54Cs can be operated in four different oscillator modes. The user can program two configuration bits (FOSC1:FOSC0) to select one of these four modes: • LP: Low Power Crystal • XT: Crystal/Resonator • HS: High Speed Crystal/Resonator • RC: Resistor/Capacitor 7.2.2 CRYSTAL OSCILLATOR / CERAMIC RESONATORS In XT, LP or HS modes, a crystal or ceramic resonator is connected to the OSC1/CLKIN and OSC2/CLKOUT pins to establish oscillation (Figure 7-2). The PIC16CR54C oscillator design requires the use of a parallel cut crystal. Use of a series cut crystal may give a frequency out of the crystal manufacturers specifications. When in XT, LP or HS modes, the device can have an external clock source drive the OSC1/CLKIN pin (Figure 7-3). FIGURE 7-2: CRYSTAL OPERATION (OR CERAMIC RESONATOR) (HS, XT OR LP OSC CONFIGURATION) Note 1: See Capacitor Selection tables for recommended 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 (approx. value = 10 M Ω). C1(1) C2(1) XTAL OSC2 OSC1 RF(3) SLEEP To internal logic RS(2) PIC16CR54C FIGURE 7-3: EXTERNAL CLOCK INPUT OPERATION (HS, XT OR LP OSC CONFIGURATION) TABLE 7-1: CAPACITOR SELECTION FOR CERAMIC RESONATORS - PIC16CR54C TABLE 7-2: CAPACITOR SELECTION FOR CRYSTAL OSCILLATOR - PIC16CR54C Osc Type Resonator Freq Cap. Range C1 Cap. Range C2 XT 455 kHz 2.0 MHz 4.0 MHz 68-100 pF 15-33 pF 10-22 pF 68-100 pF 15-33 pF 10-22 pF HS 8.0 MHz 16.0 MHz 10-22 pF 10 pF 10-22 pF 10 pF These values are for design guidance only. Since each resonator has its own characteristics, the user should consult the resonator manufacturer for appropriate values of external components. Osc Type Resonator Freq Cap.Range C1 Cap. Range C2 LP 32 kHz(1) 15 pF 15 pF XT 100 kHz 200 kHz 455 kHz 1 MHz 2 MHz 4 MHz 15-30 pF 15-30 pF 15-30 pF 15-30 pF 15 pF 15 pF 200-300 pF 100-200 pF 15-100 pF 15-30 pF 15 pF 15 pF HS 4 MHz 8 MHz 20 MHz 15 pF 15 pF 15 pF 15 pF 15 pF 15 pF Note 1: For VDD > 4.5V, C1 = C2 ≈ 30 pF is recommended. These values are for design guidance only. Rs may be required in HS mode as well as XT mode to avoid overdriving crystals with low drive level specification. Since each crystal has its own characteristics, the user should consult the crystal manufacturer for appropriate values of external components. Note: If you change from this device to another device, please verify oscillator characteristics in your application. Clock from ext. system OSC1 OSC2 PIC16CR54C Open |
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