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  • 參數(shù)資料
    型號: MC68HC11A0CFU2
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64
    封裝: QFP-64
    文件頁數(shù): 74/158頁
    文件大?。?/td> 3803K
    代理商: MC68HC11A0CFU2
    SIGNAL DESCRIPTIONS AND OPERATING MODES
    MC68HC11A8
    2-6
    TECHNICAL DATA
    2
    2.1.11.5 Port E
    Port E is used for general-purpose inputs and/or analog-to-digital (A/D) input chan-
    nels. Reading port E during the sampling portion of an A/D conversion could cause
    very small disturbances and affect the accuracy of that result. If very high accuracy is
    required, avoid reading port E during conversions.
    2.2 Operating Modes
    There are four operating modes for the MC68HC11A8: single-chip operating mode,
    expanded multiplexed operating mode, special bootstrap operating mode, and special
    test operating mode.
    Table 2-1 shows how the operating mode is selected. The following paragraphs de-
    scribe these operating modes.
    2.2.1 Single-Chip Operating Mode
    In single-chip operating mode, the MC68HC11A8 functions as a monolithic microcon-
    troller without external address or data buses. Port B, port C, strobe A, and strobe B
    function as general purpose l/O and handshake signals. Refer to 4 PARALLEL I/O for
    additional information.
    2.2.2 Expanded Multiplexed Operating Mode
    In expanded multiplexed operating mode, the MC68HC11A8 has the capability of ac-
    cessing a 64 Kbyte address space. This total address space includes the same on-
    chip memory addresses used for single-chip operating mode plus external peripheral
    and memory devices. The expansion bus is made up of port B and port C, and control
    signals AS and R/W. Figure 2-4 shows a recommended way of demultiplexing low or-
    der addresses from data at port C. The address, R/W, and AS signals are active and
    valid for all bus cycles including accesses to internal memory locations.
    F
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    Freescale Semiconductor, Inc.
    For More Information On This Product,
    Go to: www.freescale.com
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