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PIC12F683 Datasheet(PDF) 24 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 24 Page - Microchip Technology |
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24 / 148 page  PIC12F683 DS41211B-page 22 Preliminary 2004 Microchip Technology Inc. FIGURE 3-6: RCIO MODE The RC oscillator frequency is a function of the supply voltage, the resistor (REXT) and capacitor (CEXT) values and the operating temperature. Other factors affecting the oscillator frequency are: • threshold voltage variation • component tolerances • packaging variations in capacitances 3.4 Internal Clock Modes The PIC12F683 has two independent, internal oscilla- tors that can be configured or selected as the system clock source. 1. The HFINTOSC (High-Frequency Internal Oscil- lator) is factory calibrated and operates at 8 MHz. The frequency of the HFINTOSC can be user adjusted ±12% via software using the OSCTUNE register (Register 3-1). 2. The LFINTOSC (Low-Frequency Internal Oscillator) is uncalibrated and operates at approximately 31 kHz. The system clock speed can be selected via software using the Internal Oscillator Frequency Select (IRCF) bits. The system clock can be selected between external or internal clock sources via the System Clock Selection (SCS) bit (see Section 3.5 “Clock Switching”). 3.4.1 INTRC AND INTRCIO MODES The INTRC and INTRCIO modes configure the internal oscillators as the system clock source when the device is programmed using the Oscillator Selection (FOSC) bits in the Configuration Word register (Register 12-1). In INTRC mode, the OSC1 pin is available for general purpose I/O. The OSC2/CLKOUT pin outputs the selected internal oscillator frequency divided by 4. The CLKOUT signal may be used to provide a clock for external circuitry, synchronization, calibration, test or other application requirements. In INTRCIO mode, the OSC1 and OSC2 pins are available for general purpose I/O. 3.4.2 HFINTOSC The High-Frequency Internal Oscillator (HFINTOSC) is a factory calibrated 8 MHz internal clock source. The frequency of the HFINTOSC can be altered approxi- mately ±12% via software using the OSCTUNE register (Register 3-1). The output of the HFINTOSC connects to a postscaler and multiplexer (see Figure 3-1). One of seven fre- quencies can be selected via software using the IRCF bits (see Section 3.4.4 “Frequency Select Bits (IRCF)”). The HFINTOSC is enabled by selecting any frequency between 8 MHz and 125 kHz (IRCF ≠ 000) as the system clock source (SCS = 1), or when Two-Speed Start-up is enabled (IESO = 1 and IRCF ≠ 000). The HF Internal Oscillator (HTS) bit (OSCCON<2>) indicates whether the HFINTOSC is stable or not. CEXT REXT PIC12F683 OSC1 Internal Clock VDD VSS Recommended values: 3 k Ω ≤ REXT ≤ 100 kΩ CEXT > 20 pF I/O (OSC2) GP4 |
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