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PIC16F616 Datasheet(PDF) 30 Page - Microchip Technology |
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PIC16F616 Datasheet(HTML) 30 Page - Microchip Technology |
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30 / 180 page  PIC16F610/616/16HV610/616 DS41288C-page 28 Preliminary © 2007 Microchip Technology Inc. 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 OSC1. OSC2/ CLKOUT outputs the RC oscillator frequency divided by 4. This signal may be used to provide a clock for external circuitry, synchronization, calibration, test or other application requirements. Figure 3-5 shows the external RC mode connections. FIGURE 3-5: EXTERNAL RC MODES In RCIO mode, the RC circuit is connected to OSC1. OSC2 becomes an additional general purpose I/O pin. 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 capacitance The user also needs to take into account variation due to tolerance of external RC components used. 3.4 Internal Clock Modes The Oscillator module provides a selectable system clock source of either 4 MHz or 8 MHz. The selectable frequency is configured through the IOSCFS bit of the Configuration Word. The frequency of the internal oscillator can be can be user-adjusted via software using the OSCTUNE register. 3.4.1 INTOSC AND INTOSCIO MODES The INTOSC and INTOSCIO modes configure the internal oscillators as the system clock source when the device is programmed using the oscillator selection or the FOSC<2:0> bits in the Configuration Word register (CONFIG). See Section 12.0 “Special Features of the CPU” for more information. In INTOSC mode, OSC1/CLKIN is available for general purpose I/O. OSC2/CLKOUT 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 INTOSCIO mode, OSC1/CLKIN and OSC2/CLKOUT are available for general purpose I/O. OSC2/CLKOUT(1) CEXT REXT PIC® MCU OSC1/CLKIN FOSC/4 or Internal Clock VDD VSS Recommended values: 10 k Ω ≤ REXT ≤ 100 kΩ, <3V 3 k Ω ≤ REXT ≤ 100 kΩ, 3-5V CEXT > 20 pF, 2-5V Note 1: Alternate pin functions are listed in Section 1.0 “Device Overview”. 2: Output depends upon RC or RCIO Clock mode. I/O(2) |
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