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PIC12F683 Datasheet(PDF) 21 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 21 Page - Microchip Technology |
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21 / 148 page  2004 Microchip Technology Inc. Preliminary DS41211B-page 19 PIC12F683 3.0 CLOCK SOURCES 3.1 Overview The PIC12F683 has a wide variety of clock sources and selection features to allow it to be used in a wide range of applications while maximizing performance and mini- mizing power consumption. Figure 3-1 illustrates a block diagram of the PIC12F683 clock sources. Clock sources can be configured from external oscilla- tors, quartz crystal resonators, ceramic resonators and Resistor-Capacitor (RC) circuits. In addition, the sys- tem clock source can be configured from one of two internal oscillators, with a choice of speeds selectable via software. Additional clock features include: • Selectable system clock source between external or internal via software. • Two-Speed Clock Start-up mode, which minimizes latency between external oscillator start-up and code execution. • Fail-Safe Clock Monitor (FSCM) designed to detect a failure of the external clock source (LP, XT, HS, EC or RC modes) and switch to the internal oscillator. The PIC12F683 can be configured in one of eight clock modes. 1. EC – External clock with I/O on GP4. 2. LP – Low gain crystal or Ceramic Resonator Oscillator mode. 3. XT – Medium gain crystal or Ceramic Resonator Oscillator mode. 4. HS – High gain crystal or Ceramic Resonator mode. 5. RC – External Resistor-Capacitor (RC) with FOSC/4 output on GP4 6. RCIO – External Resistor-Capacitor with I/O on GP4. 7. INTRC – Internal oscillator with FOSC/4 output on GP4 and I/O on GP5. 8. INTRCIO – Internal oscillator with I/O on GP4 and GP5. Clock source modes are configured by the FOSC<2:0> bits in the Configuration Word register (see Section 12.0 “Special Features of the CPU”). The internal clock can be generated by two oscillators. The HFINTOSC is a high-frequency calibrated oscillator. The LFINTOSC is a low-frequency uncalibrated oscillator. FIGURE 3-1: PIC12F683 CLOCK SOURCE BLOCK DIAGRAM (CPU and Peripherals) OSC1 OSC2 Sleep External Oscillator LP, XT, HS, RC, RCIO, EC System Clock 8 MHz 4 MHz 2 MHz 1 MHz 500 kHz 125 kHz 250 kHz IRCF<2:0> 111 110 101 100 011 010 001 000 31 kHz Power-up Timer (PWRT) FOSC<2:0> (Configuration Word) SCS (OSCCON<0>) Internal Oscillator (OSCCON<6:4>) Watchdog Timer (WDT) Fail-Safe Clock Monitor (FSCM) HFINTOSC 8 MHz LFINTOSC 31 kHz |
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