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  • 參數(shù)資料
    型號: P89V51RB2BBC
    廠商: NXP SEMICONDUCTORS
    元件分類: 微控制器/微處理器
    英文描述: 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
    中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
    封裝: 10 X 10 MM, 1 MM HEIGHT, PLASTIC, MS-026, TQFP-44
    文件頁數(shù): 67/77頁
    文件大?。?/td> 350K
    代理商: P89V51RB2BBC
    Philips Semiconductors
    P89V51RB2/RC2/RD2
    8-bit microcontrollers with 80C51 core
    Product data
    Rev. 03 — 02 December 2004
    67 of 77
    9397 750 14341
    Koninklijke Philips Electronics N.V. 2004. All rights reserved.
    11.1 Explanation of symbols
    Each timing symbol has 5 characters. The first character is always a ‘T’ (stands for
    time). The other characters, depending on their positions, stand for the name of a
    signal or the logical status of that signal. The following is a list of all the characters
    and what they stand for.
    A —
    Address
    C —
    Clock
    D —
    Input data
    H —
    Logic level HIGH
    I —
    Instruction (program memory contents)
    L —
    Logic level LOW or ALE
    P —
    PSEN
    Q —
    Output data
    R —
    RD signal
    T —
    Time
    V —
    Valid
    W —
    WR signal
    X —
    No longer a valid logic level
    Z —
    High impedance (Float)
    Example:
    T
    AVLL
    = Time from Address Valid to ALE LOW
    T
    LLPL
    = Time from ALE LOW to PSEN LOW
    Fig 30. External program memory read cycle.
    002aaa548
    PORT 2
    PSEN
    ALE
    A0 - A7
    tLLAX
    tPLAZ
    tPXIZ
    tLLPL
    tAVIV
    tAVLL
    tLHLL
    tLLIV
    tPLIV
    tPLPH
    INSTR IN
    A8 - A15
    A8 - A15
    A0 - A7
    PORT 0
    tPXIX
    tPXAV
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    參數(shù)描述
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