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    參數(shù)資料
    型號: PIC16F627-04/SO
    廠商: Microchip Technology
    文件頁數(shù): 117/170頁
    文件大?。?/td> 0K
    描述: IC MCU FLASH 1KX14 COMP 18SOIC
    產品培訓模塊: Asynchronous Stimulus
    8-bit PIC® Microcontroller Portfolio
    標準包裝: 42
    系列: PIC® 16F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 4MHz
    連通性: UART/USART
    外圍設備: 欠壓檢測/復位,POR,PWM,WDT
    輸入/輸出數(shù): 16
    程序存儲器容量: 1.75KB(1K x 14)
    程序存儲器類型: 閃存
    EEPROM 大?。?/td> 128 x 8
    RAM 容量: 224 x 8
    電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
    振蕩器型: 內部
    工作溫度: 0°C ~ 70°C
    封裝/外殼: 18-SOIC(0.295",7.50mm 寬)
    包裝: 管件
    配用: XLT18SO-1-ND - SOCKET TRANSITION 18SOIC 300MIL
    AC164010-ND - MODULE SKT PROMATEII DIP/SOIC
    PIC16F62X
    DS40300C-page 48
    Preliminary
    2003 Microchip Technology Inc.
    7.3
    Timer1 Operation in
    Asynchronous Counter Mode
    If control bit T1SYNC (T1CON<2>) is set, the external
    clock input is not synchronized. The timer continues to
    increment asynchronous to the internal phase clocks.
    The timer will continue to run during SLEEP and can
    generate an interrupt on overflow which will wake-up
    the processor. However, special precautions in soft-
    ware are needed to read/write the timer (Section 7.3.2).
    In Asynchronous Counter mode, Timer1 can not be
    used
    as
    a
    time-base
    for
    capture
    or
    compare
    operations.
    7.3.1
    EXTERNAL CLOCK INPUT TIMING
    WITH UNSYNCHRONIZED CLOCK
    If control bit T1SYNC is set, the timer will increment
    completely asynchronously. The input clock must meet
    certain minimum high-time and low-time requirements.
    Refer to the appropriate Electrical Specifications
    section, Timing Parameters 45, 46, and 47.
    7.3.2
    READING AND WRITING TIMER1 IN
    ASYNCHRONOUS COUNTER
    MODE
    Reading TMR1H or TMR1L while the timer is running,
    from an external asynchronous clock, will ensure a
    valid read (taken care of in hardware). However, the
    user should keep in mind that reading the 16-bit timer
    in two 8-bit values itself poses certain problems since
    the timer may overflow between the reads.
    For writes, it is recommended that the user simply stop
    the timer and write the desired values. A write
    contention may occur by writing to the timer registers
    while the register is incrementing. This may produce an
    unpredictable value in the timer register.
    Reading
    the
    16-bit
    value
    requires
    some
    care.
    Example 7-1 is an example routine to read the 16-bit
    timer value. This is useful if the timer cannot be
    stopped.
    EXAMPLE 7-1:
    READING A 16-BIT FREE-
    RUNNING TIMER
    ; All interrupts are disabled
    MOVF
    TMR1H, W
    ;Read high byte
    MOVWF
    TMPH
    ;
    MOVF
    TMR1L, W
    ;Read low byte
    MOVWF
    TMPL
    ;
    MOVF
    TMR1H, W
    ;Read high byte
    SUBWF
    TMPH,
    W
    ;Sub 1st read
    ; with 2nd read
    BTFSC
    STATUS,Z
    ;Is result = 0
    GOTO
    CONTINUE
    ;Good 16-bit read
    ;
    ; TMR1L may have rolled over between the read
    ; of the high and low bytes. Reading the high
    ; and low bytes now will read a good value.
    ;
    MOVF
    TMR1H, W
    ;Read high byte
    MOVWF
    TMPH
    ;
    MOVF
    TMR1L, W
    ;Read low byte
    MOVWF
    TMPL
    ;
    ; Re-enable the Interrupts (if required)
    CONTINUE
    ;Continue with your code
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