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    參數(shù)資料
    型號: PSD412A2-C-15L
    廠商: 意法半導體
    英文描述: Low Cost Field Programmable Microcontroller Peripherals
    中文描述: 低成本現(xiàn)場可編程微控制器外圍設備
    文件頁數(shù): 52/123頁
    文件大小: 657K
    代理商: PSD412A2-C-15L
    PSD4XX Famly
    49
    9.3.3 Address Out
    For microcontrollers with a multiplexed address/data bus, the I/O ports in Address-Out
    mode are able to provide latched address outputs (A0 – A15) to external devices. This
    mode of operation requires the user to:
    J
    Configuration
    1.Declare the pins used as address line outputs in the ABEL file (PSDsoft).
    2.Write “0” to the corresponding bit in the Control Register associated with each
    I/O port.
    3.Set the Direction Register to Output Mode.
    9.3.4 Address In
    There are two Address In modes:
    1. For Port A - as other address line (A2-A7 and A16-A23) inputs to the DPLD. Additional
    address inputs included in the EPROM decoding must come from Port A. The address
    inputs are latched internally by ALE/AS if Multiplexed Bus is specified in PSDsoft.
    2. For Ports C and D – as address inputs to the ZPLD for general decoding,
    should not be used in EPROM decoding.
    J
    Configuration
    1.Declare pins or signals used as Address In in the ABEL file (PSDsoft).
    2.Write latch equations in the .ABL file, e.g., A16.LE = ALE.
    3.Include latched address in logic equations.
    9.3.5 Data Port
    In this mode, the port is acting as a data bus port for a microcontroller which has a
    non-multiplexed address/data bus. The Data Port is connected to the data bus of the
    microcontroller and the ADIO port is connected to the address bus.
    J
    Configuration
    Select the non-multiplexed bus option in PSD configuration (PSDsoft).
    9.3.6 Alternate Function In
    This mode is per-pin configurable and enables the user to define pin PE7 of Port E as
    Automatic Power Down (APD) CLK input.
    J
    Configuration
    1.Select input functions in PSD configuration.
    2.PSD Compiler assigns pins for the selected options.
    The PSD4XX
    Architecture
    (cont.)
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