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PIC12CE673 数据表(PDF) 46 Page - Microchip Technology |
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PIC12CE673 数据表(HTML) 46 Page - Microchip Technology |
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46 / 116 page  PIC12CE67X DS40181B-page 46 Preliminary © 1998 Microchip Technology Inc. 9.2 Oscillator Configurations 9.2.1 OSCILLATOR TYPES The PIC12CE67X can be operated in seven different oscillator modes. The user can program three configuration bits (FOSC2:FOSC0) to select one of these seven modes: • LP: Low Power Crystal • HS: High Speed Crystal Resonator • XT: Crystal/Resonator • INTRC*: Internal 4 MHz Oscillator • EXTRC*: External Resistor/Capacitor *Can be configured to support CLKOUT 9.2.2 CRYSTAL OSCILLATOR / CERAMIC RESONATORS In XT, HS or LP modes, a crystal or ceramic resonator is connected to the GP5/OSC1/CLKIN and GP4/OSC2 pins to establish oscillation (Figure 9-2). The PIC12CE67X 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, HS or LP modes, the device can have an external clock source drive the GP5/OSC1/CLKIN pin (Figure 9-3). FIGURE 9-2: CRYSTAL OPERATION (OR CERAMIC RESONATOR) (XT, HS OR LP OSC CONFIGURATION) FIGURE 9-3: EXTERNAL CLOCK INPUT OPERATION (XT, HS 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) PIC12CE67X Clock from ext. system OSC1 OSC2 PIC12CE67X Open TABLE 9-1: CAPACITOR SELECTION FOR CERAMIC RESONATORS - PIC12CE67X TABLE 9-2: CAPACITOR SELECTION FOR CRYSTAL OSCILLATOR - PIC12CE67X Osc Type Resonator Freq Cap. Range C1 Cap. Range C2 XT 455 kHz 2.0 MHz 4.0 MHz 22-100 pF 15-68 pF 15-68 pF 22-100 pF 15-68 pF 15-68 pF HS 4.0 MHz 8.0 MHz 10.0 MHz 15-68 pF 10-68 pF 10-22 pF 15-68 pF 10-68 pF 10-22 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) 100 kHz 200 kHz 15 pF 15-30 pF 15-30 pF 15 pF 30-47 pF 15-82 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 15-30 pF 15-47 pF 200-300 pF 100-200 pF 15-100 pF 15-30 pF 15-30 pF 15-47 pF HS 4 MHz 8 MHz 10 MHz 15-30 pF 15-30 pF 15-30 pF 15-30 pF 15-30 pF 15-30 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. |
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