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  • 參數資料
    型號: PIC16F871-E/P
    廠商: Microchip Technology
    文件頁數: 95/143頁
    文件大?。?/td> 0K
    描述: IC MCU CMOS 20MHZ 2K FLASH 40DIP
    產品培訓模塊: Asynchronous Stimulus
    標準包裝: 10
    系列: PIC® 16F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: UART/USART
    外圍設備: 欠壓檢測/復位,POR,PWM,WDT
    輸入/輸出數: 33
    程序存儲器容量: 3.5KB(2K x 14)
    程序存儲器類型: 閃存
    EEPROM 大小: 64 x 8
    RAM 容量: 128 x 8
    電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
    數據轉換器: A/D 8x10b
    振蕩器型: 外部
    工作溫度: -40°C ~ 125°C
    封裝/外殼: 40-DIP(0.600",15.24mm)
    包裝: 管件
    配用: I3-DB16F871-ND - BOARD DAUGHTER ICEPIC3
    2003 Microchip Technology Inc.
    DS30569B-page 53
    PIC16F870/871
    7.0
    TIMER2 MODULE
    Timer2 is an 8-bit timer with a prescaler and a
    postscaler. It can be used as the PWM time base for the
    PWM mode of the CCP module(s). The TMR2 register
    is readable and writable, and is cleared on any device
    RESET.
    The input clock (FOSC/4) has a prescale option of 1:1,
    1:4,
    or
    1:16,
    selected
    by
    control
    bits
    T2CKPS1:T2CKPS0 (T2CON<1:0>).
    The Timer2 module has an 8-bit period register, PR2.
    Timer2 increments from 00h until it matches PR2 and
    then resets to 00h on the next increment cycle. PR2 is
    a readable and writable register. The PR2 register is
    initialized to FFh upon RESET.
    The match output of TMR2 goes through a 4-bit
    postscaler (which gives a 1:1 to 1:16 scaling inclusive)
    to generate a TMR2 interrupt (latched in flag bit
    TMR2IF (PIR1<1>)).
    Timer2 can be shut-off by clearing control bit, TMR2ON
    (T2CON<2>), to minimize power consumption.
    Register 7-1 shows the Timer2 control register.
    Additional information on timer modules is available in
    the PICmicro Mid-Range MCU Family Reference
    Manual (DS33023).
    FIGURE 7-1:
    TIMER2 BLOCK DIAGRAM
    REGISTER 7-1:
    T2CON: TIMER2 CONTROL REGISTER (ADDRESS 12h)
    Comparator
    TMR2
    Sets Flag
    TMR2 Reg
    Output(1)
    RESET
    Postscaler
    Prescaler
    PR2 Reg
    2
    FOSC/4
    1:1
    1:16
    1:1, 1:4, 1:16
    EQ
    4
    bit TMR2IF
    Note 1: TMR2 register output can be software selected by the
    SSP module as a baud clock.
    to
    T2OUTPS3:
    T2OUTPS0
    T2CKPS1:
    T2CKPS0
    U-0
    R/W-0
    TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON
    T2CKPS1 T2CKPS0
    bit 7
    bit 0
    bit 7
    Unimplemented: Read as '0'
    bit 6-3
    TOUTPS3:TOUTPS0: Timer2 Output Postscale Select bits
    0000
    = 1:1 Postscale
    0001
    = 1:2 Postscale
    0010
    = 1:3 Postscale
    1111
    = 1:16 Postscale
    bit 2
    TMR2ON: Timer2 On bit
    1
    = Timer2 is on
    0
    = Timer2 is off
    bit 1-0
    T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits
    00
    = Prescaler is 1
    01
    = Prescaler is 4
    1x
    = Prescaler is 16
    Legend:
    R = Readable bit
    W = Writable bit
    U = Unimplemented bit, read as ‘0’
    - n = Value at POR
    ‘1’ = Bit is set
    ‘0’ = Bit is cleared
    x = Bit is unknown
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    參數描述
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