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  • 參數(shù)資料
    型號(hào): PIC16F72-I/ML
    廠商: Microchip Technology
    文件頁數(shù): 97/136頁
    文件大?。?/td> 0K
    描述: IC PIC MCU FLASH 2KX14 28-QFN
    產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
    8-bit PIC® Microcontroller Portfolio
    標(biāo)準(zhǔn)包裝: 61
    系列: PIC® 16F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: I²C,SPI
    外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 22
    程序存儲(chǔ)器容量: 3.5KB(2K x 14)
    程序存儲(chǔ)器類型: 閃存
    RAM 容量: 128 x 8
    電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
    振蕩器型: 外部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 28-VQFN 裸露焊盤
    包裝: 管件
    產(chǎn)品目錄頁面: 639 (CN2011-ZH PDF)
    配用: AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
    其它名稱: PIC16F72-I/MLR
    PIC16F72-I/MLR-ND
    2007 Microchip Technology Inc.
    DS39597C-page 61
    PIC16F72
    11.2
    Oscillator Configurations
    11.2.1
    OSCILLATOR TYPES
    The PIC16F72 can be operated in four different Oscil-
    lator modes. The user can program two configuration
    bits (FOSC1 and FOSC0) to select one of these four
    modes:
    LP
    Low Power Crystal
    XT
    Crystal/Resonator
    HS
    High Speed Crystal/Resonator
    RC
    Resistor/Capacitor
    11.2.2
    CRYSTAL OSCILLATOR/CERAMIC
    RESONATORS
    In XT, LP or HS modes, a crystal or ceramic resonator
    is connected to the OSC1/CLKI and OSC2/CLKO pins
    to establish oscillation (Figure 11-1). The PIC16F72
    oscillator design requires the use of a parallel cut crys-
    tal. Use of a series cut crystal may give a frequency out
    of the crystal manufacturers specifications. When in HS
    mode, the device can accept an external clock source
    to drive the OSC1/CLKI pin (Figure 11-2). See
    Figure 14-1 or Figure 14-2 (depending on the part
    number and VDD range) for valid external clock
    frequencies.
    FIGURE 11-1:
    CRYSTAL/CERAMIC
    RESONATOR OPERATION
    (HS, XT OR LP
    OSC CONFIGURATION)
    FIGURE 11-2:
    EXTERNAL CLOCK INPUT
    OPERATION (HS OSC
    CONFIGURATION)
    TABLE 11-1:
    CERAMIC RESONATORS
    (FOR DESIGN
    GUIDANCE ONLY)
    Note
    1: See Table 11-1 and Table 11-2 for typical
    values of C1 and C2.
    2: A series resistor (RS) may be required for
    AT strip cut crystals.
    3: RF varies with the crystal chosen.
    C1(1)
    C2(1)
    XTAL
    OSC2
    OSC1
    RF(3)
    SLEEP
    To
    logic
    PIC16F72
    RS(2)
    internal
    Typical Capacitor Values Used:
    Mode
    Freq
    OSC1
    OSC2
    XT
    455 kHz
    2.0 MHz
    4.0 MHz
    56 pF
    47 pF
    33 pF
    56 pF
    47 pF
    33 pF
    HS
    8.0 MHz
    16.0 MHz
    27 pF
    22 pF
    27 pF
    22 pF
    Capacitor values are for design guidance only.
    These capacitors were tested with the resonators
    listed below for basic start-up and operation. These
    values were not optimized.
    Different capacitor values may be required to produce
    acceptable oscillator operation. The user should test
    the performance of the oscillator over the expected
    VDD and temperature range for the application.
    See the notes at the bottom of page 62 for additional
    information.
    OSC1
    OSC2
    Open
    Clock from
    Ext. System
    PIC16F72
    (HS Mode)
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