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PIC12F683 Datasheet(PDF) 23 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 23 Page - Microchip Technology |
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23 / 148 page  2004 Microchip Technology Inc. Preliminary DS41211B-page 21 PIC12F683 3.3.3 LP, XT, HS MODES The LP, XT and HS modes support the use of quartz crystal resonators or ceramic resonators connected to the OSC1 and OSC2 pins (Figure 3-1). The mode selects a low, medium or high gain setting of the inter- nal inverter-amplifier to support various resonator types and speed. LP Oscillator mode selects the lowest gain setting of the internal inverter-amplifier. LP mode current con- sumption is the least of the three modes. This mode is best suited to drive resonators with a low drive level specification, for example, tuning fork type crystals. XT Oscillator mode selects the intermediate gain set- ting of the internal inverter-amplifier. XT mode current consumption is the medium of the three modes. This mode is best suited to drive resonators with a medium drive level specification, for example, AT-cut quartz crystal resonators. HS Oscillator mode selects the highest gain setting of the internal inverter-amplifier. HS mode current con- sumption is the highest of the three modes. This mode is best suited for resonators that require a high drive setting, for example, AT-cut quartz crystal resonators or ceramic resonators. Figure 3-3 and Figure 3-4 show typical circuits for quartz crystal and ceramic resonators, respectively. FIGURE 3-3: QUARTZ CRYSTAL OPERATION (LP, XT OR HS MODE) FIGURE 3-4: CERAMIC RESONATOR OPERATION (XT OR HS MODE) 3.3.4 EXTERNAL RC MODES The External Resistor-Capacitor (RC) modes support the use of an external RC circuit. This allows the designer maximum flexibility in frequency choice while keeping costs to a minimum when clock accuracy is not required. There are two modes, RC and RCIO. In RC mode, the RC circuit connects to the OSC1 pin. The OSC2/CLKOUT pin outputs the RC oscillator fre- quency divided by 4. This signal may be used to provide a clock for external circuitry, synchronization, calibra- tion, test or other application requirements. Figure 3-5 shows the RC mode connections. FIGURE 3-5: RC MODE In RCIO mode, the RC circuit is connected to the OSC1 pin. The OSC2 pin becomes an additional general pur- pose I/O pin. The I/O pin becomes bit 4 of GPIO (GP4). Figure 3-6 shows the RCIO mode connections. Note 1: Quartz crystal characteristics vary according to type, package and manufac- turer. The user should consult the manu- facturer data sheets for specifications and recommended application. 2: Always verify oscillator performance over the VDD and temperature range that is expected for the application. Note 1: A series resistor (RS) may be required for quartz crystals with low drive level. 2: The value of RF varies with the oscillator mode selected (typically between 2 M Ω to 10 M Ω). C1 C2 Quartz OSC2 RS(1) OSC1 RF(2) Sleep PIC12F683 Crystal To Internal Logic Note 1: A series resistor (RS) may be required for ceramic resonators with low drive level. 2: The value of RF varies with the oscillator mode selected (typically between 2 M Ω to 10 M Ω). 3: An additional parallel feedback resistor (RP) may be required for proper ceramic resonator operation (typical value 1 M Ω). C1 C2 Ceramic OSC2 RS(1) OSC1 RF(2) Sleep To Internal Logic PIC12F683 RP(3) Resonator OSC2/CLKOUT CEXT REXT PIC12F683 OSC1 FOSC/4 Internal Clock VDD VSS Recommended values: 3 k Ω ≤ REXT ≤ 100 kΩ CEXT > 20 pF |
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