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PIC18LF010 Datasheet(PDF) 10 Page - Microchip Technology |
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PIC18LF010 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 176 page  PIC18F010/020 DS41142A-page 8 Preliminary 2001 Microchip Technology Inc. TABLE 2-1: CERAMIC RESONATORS TABLE 2-2: CAPACITOR SELECTION FOR CRYSTAL OSCILLATOR 2.3 RC Oscillator For applications where precise timing is not a require- ment, the RC and RCIO oscillator options are available. The operation and functionality of the RC oscillator is dependent on a number of variables. The RC oscillator is a function of the supply voltage, the resistor (REXT) and capacitor (CEXT) values, and the operating temper- ature. The oscillator frequency will vary from unit to unit due to normal process parameter variation. Plus, the difference in lead frame capacitance between package types will also affect the oscillation frequency, espe- cially for low CEXT values. The user also needs to account for the tolerance of the external R and C com- ponents. Figure 2-3 shows how the R/C combination is connected. FIGURE 2-3: RC OSCILLATOR MODE In the RC mode, the oscillator frequency divided by 4 is available on the OSC2 pin. This signal may be used for test purposes, or to synchronize other logic. In the RCIO mode, the OSC2 pin becomes a general purpose I/O pin. This pin is RB4 of PORTB. 2.4 The Internal Oscillator The INTOSC and INTOSCIO device options are avail- able to minimize part count and cost, while maximizing the number of I/O pins. There are five different frequen- cies of which the user has the option to select. They are 32 kHz, 500 kHz, 1 MHz, 4 MHz, and 8 MHz. The 1 MHz, 4 MHz, and 8 MHz internal clock selections are all derived from one 8 MHz clock source, and the other two are produced independently. Tuning is available for the 1 MHz, 4 MHz, and 8 MHz options; refer to Section 2.10. 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 32.0 kHz 33 pF 33 pF 200 kHz 15 pF 15 pF XT 200 kHz 47-68 pF 47-68 pF 1.0 MHz 15 pF 15 pF 4.0 MHz 15 pF 15 pF HS 4.0 MHz 15 pF 15 pF 8.0 MHz 15-33 pF 15-33 pF 20.0 MHz 15-33 pF 15-33 pF 25.0 MHz TBD TBD These values are for design guidance only. See notes at bottom of page. Crystals Used 32.0 kHz Epson C-001R32.768K-A ± 20 PPM 200 kHz STD XTL 200.000KHz ± 20 PPM 1.0 MHz ECS ECS-10-13-1 ± 50 PPM 4.0 MHz ECS ECS-40-20-1 ± 50 PPM 8.0 MHz EPSON CA-301 8.000M-C ± 30 PPM 20.0 MHz EPSON CA-301 20.000M-C ± 30 PPM Note 1: Recommended values of C1 and C2 are identical to the ranges tested (Table 2-1). 2: Higher capacitance increases the stability of the oscillator, but also increases the start-up time. 3: Since each resonator/crystal has its own characteristics, the user should consult the resonator/crystal manufacturer for appro- priate 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 specification. Note: The RC oscillator is not recommended for applications that require precise timing. OSC2/CLKO CEXT REXT PIC18F010/020 OSC1 FOSC/4 Internal Clock VDD VSS Recommended values: 3 k Ω ≤ REXT ≤ 100 kΩ CEXT > 20pF |
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