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PIC16LF1906-ISOQTP 数据表(PDF) 60 Page - Microchip Technology |
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PIC16LF1906-ISOQTP 数据表(HTML) 60 Page - Microchip Technology |
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60 / 288 page  PIC16LF1904/6/7 DS41569A-page 60 Preliminary 2011 Microchip Technology Inc. 6.2.1.2 Secondary Oscillator The secondary oscillator is a separate crystal oscillator that is associated with the Timer1 peripheral. It is opti- mized for timekeeping operations with a 32.768 kHz crystal connected between the T1CKI/T1OSO and T1OSI device pins. The secondary oscillator can be used as an alternate system clock source and can be selected during run-time using clock switching. Refer to Section 6.3 “Clock Switching” for more information. FIGURE 6-3: QUARTZ CRYSTAL OPERATION (SECONDARY OSCILLATOR) 6.2.2 INTERNAL CLOCK SOURCES The device may be configured to use the internal oscil- lator block as the system clock by performing one of the following actions: • Program the FOSC<1:0> bits in Configuration Word 1 to select the INTOSC clock source, which will be used as the default system clock upon a device Reset. • Write the SCS<1:0> bits in the OSCCON register to switch the system clock source to the internal oscillator during run-time. See Section 6.3 “Clock Switching” for more information. In INTOSC mode, CLKIN is available for general purpose I/O. CLKOUT is available for general purpose I/O or CLKOUT. The function of the CLKOUT pin is determined by the state of the CLKOUTEN bit in Configuration Word 1. The internal oscillator block has two independent oscillators that provides the internal system clock source. 1. The HFINTOSC (High-Frequency Internal Oscillator) is factory calibrated and operates at 16 MHz. 2. The LFINTOSC (Low-Frequency Internal Oscillator) is uncalibrated and operates at 31 kHz. 6.2.2.1 HFINTOSC The High-Frequency Internal Oscillator (HFINTOSC) is a factory calibrated 16 MHz internal clock source. The output of the HFINTOSC connects to a postscaler and multiplexer (see Figure 6-1). The frequency derived from the HFINTOSC can be selected via software using the IRCF<3:0> bits of the OSCCON register. See Section 6.2.2.4 “Internal Oscillator Clock Switch Timing” for more information. The HFINTOSC is enabled by: • Configure the IRCF<3:0> bits of the OSCCON register for the desired HF frequency, and •FOSC<1:0> = 11, or • Set the System Clock Source (SCS) bits of the OSCCON register to ‘1x’. The High-Frequency Internal Oscillator Ready bit (HFIOFR) of the OSCSTAT register indicates when the HFINTOSC is running and can be utilized. The High-Frequency Internal Oscillator Status Stable bit (HFIOFS) of the OSCSTAT register indicates when the HFINTOSC is running within 0.5% of its final value. Note 1: Quartz crystal characteristics vary according to type, package and manufacturer. The user should consult the manufacturer data sheets for specifications and recommended application. 2: Always verify oscillator performance over the VDD and temperature range that is expected for the application. 3: For oscillator design assistance, reference the following Microchip Applications Notes: • AN826, “Crystal Oscillator Basics and Crystal Selection for rfPIC® and PIC® Devices ” (DS00826) • AN849, “Basic PIC® Oscillator Design” (DS00849) • AN943, “Practical PIC® Oscillator Analysis and Design ” (DS00943) • AN949, “Making Your Oscillator Work” (DS00949) • TB097, “Interfacing a Micro Crystal MS1V-T1K 32.768 kHz Tuning Fork Crystal to a PIC16F690/SS ” (DS91097) • AN1288, “Design Practices for Low-Power External Oscillators ” (DS01288) C1 C2 32.768 kHz T1CKI/T1OSO To Internal Logic PIC® MCU Crystal T1OSI Quartz |
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