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PIC16CE623-20/SS Datasheet(PDF) 51 Page - Microchip Technology |
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PIC16CE623-20/SS Datasheet(HTML) 51 Page - Microchip Technology |
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51 / 108 page  © 1998 Microchip Technology Inc. Preliminary DS40182A-page 51 PIC16CE62X 10.2 Oscillator Configurations 10.2.1 OSCILLATOR TYPES The PIC16CE62X can be operated in four different oscillator options. The user can program two configuration bits (FOSC1 and FOSC0) to select one of these four modes: • LP Low Power Crystal • XT Crystal/Resonator • HS High Speed Crystal/Resonator • RC Resistor/Capacitor 10.2.2 CRYSTAL OSCILLATOR / CERAMIC RESONATORS In XT, LP or HS modes a crystal or ceramic resonator is connected to the OSC1 and OSC2 pins to establish oscillation (Figure 10-2). The PIC16CE62X) 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 to drive the OSC1 pin (Figure 10-3). FIGURE 10-2: CRYSTAL OPERATION (OR CERAMIC RESONATOR) (HS, XT OR LP OSC CONFIGURATION) FIGURE 10-3: EXTERNAL CLOCK INPUT OPERATION (HS, XT OR LP OSC CONFIGURATION) See Table 10-1 and Table 10-2 for recommended values of C1 and C2. Note: A series resistor may be required for AT strip cut crystals. C1 C2 XTAL OSC2 RS OSC1 RF SLEEP To internal logic PIC16CE62X see Note Clock from ext. system PIC16CE62X OSC1 OSC2 Open TABLE 10-1: CERAMIC RESONATORS, PIC16CE62X TABLE 10-2: CAPACITOR SELECTION FOR CRYSTAL OSCILLATOR, PIC16CE62X 1. Recommended values of C1 and C2 are identical to the ranges tested table. 2. Higher capacitance increases the stability of oscillator but also increases the start-up time. 3. Since each resonator/crystal has its own characteristics, the user should consult the resonator/crystal manufac- turer for appropriate values of external components. 4. Rs may be required in HS mode as well as XT mode to avoid overdriving crystals with low drive level specifica- tion. Ranges Tested: Mode Freq OSC1 OSC2 XT 455 kHz 2.0 MHz 4.0 MHz 68 - 100 pF 15 - 68 pF 15 - 68 pF 68 - 100 pF 15 - 68 pF 15 - 68 pF HS 8.0 MHz 16.0 MHz 10 - 68 pF 10 - 22 pF 10 - 68 pF 10 - 22 pF These values are for design guidance only. See notes at bottom of page. Resonators Used: 455 kHz Panasonic EFO-A455K04B ± 0.3% 2.0 MHz Murata Erie CSA2.00MG ± 0.5% 4.0 MHz Murata Erie CSA4.00MG ± 0.5% 8.0 MHz Murata Erie CSA8.00MT ± 0.5% 16.0 MHz Murata Erie CSA16.00MX ± 0.5% All resonators used did not have built-in capacitors. Osc Type Crystal Freq Cap. Range C1 Cap. Range C2 LP 32 kHz 33 pF 33 pF 200 kHz 15 pF 15 pF XT 200 kHz 47-68 pF 47-68 pF 1 MHz 15 pF 15 pF 4 MHz 15 pF 15 pF HS 4 MHz 15 pF 15 pF 8 MHz 15-33 pF 15-33 pF 20 MHz 15-33 pF 15-33 pF These values are for design guidance only. See notes at bottom of page. Crystals Used 32 kHz Epson C-001R32.768K-A ± 20 PPM 200 kHz STD XTL 200.000KHz ± 20 PPM 1 MHz ECS ECS-10-13-1 ± 50 PPM 4 MHz ECS ECS-40-20-1 ± 50 PPM 8 MHz EPSON CA-301 8.000M-C ± 30 PPM 20 MHz EPSON CA-301 20.000M-C ± 30 PPM 62X.bk Page 51 Tuesday, March 10, 1998 3:40 PM |
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