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    參數(shù)資料
    型號: PSD835F3-A-12U
    廠商: 意法半導體
    英文描述: Configurable Memory System on a Chip for 8-Bit Microcontrollers
    中文描述: 在8片位微控制器可配置存儲系統(tǒng)
    文件頁數(shù): 42/110頁
    文件大?。?/td> 570K
    代理商: PSD835F3-A-12U
    PSD835G2
    PSD8XX Family
    41
    9.2.2.6 Input Micro
    Cells (IMCs)
    The CPLD has 24 IMCs, one for each pin on Ports A, B, and C. The architecture of the IMC
    is shown in Figure 14. The IMCs are individually configurable, and can be used as a latch,
    register, or to pass incoming Port signals prior to driving them onto the PLD input bus. The
    outputs of the IMCs can be read by the microcontroller through the internal data bus.
    The enable for the latch and clock for the register are driven by a multiplexer whose inputs
    are a product term from the CPLD AND array or the MCU address strobe (ALE/AS). Each
    product term output is used to latch or clock four IMCs. Port inputs 3-0 can be controlled by
    one product term and 7-4 by another.
    Configurations for the IMCs are specified by PSDsoft. Outputs of the IMCs can be read by
    the MCU via the IMC buffer. See the I/O Port section on how to read the IMCs.
    IMCs can use the address strobe to latch address bits higher than A15. Any latched
    addresses are routed to the PLDs as inputs.
    IMCs are particularly useful with handshaking communication applications where two
    processors pass data back and forth through a common mailbox. Figure 15 shows a typical
    configuration where the Master MCU writes to the Port A Data Out Register. This, in turn,
    can be read by the Slave MCU via the activation of the
    Slave-Read
    output enable product
    term. The Slave can also write to the Port A IMCs and the Master can then read the IMCs
    directly. Note that the
    Slave-Read
    and
    Slave-Wr
    signals are product terms that are
    derived from the Slave MCU inputs RD, WR, and Slave_CS.
    The
    PSD835G2
    Functional
    Blocks
    (cont.)
    OUTPUT
    MICRO
    CELLS A
    AND
    MICRO
    CELL B
    PT
    PT
    FEEDBACK
    A
    P
    PORT
    DRIVER
    I/O PIN
    INTERNAL DATA BUS
    DIRECTION
    REGISTER
    MUX
    MUX
    ALE/AS
    PT
    Q
    Q
    D
    D
    G
    LATCH
    INPUT MICRO
    CELL
    ENABLE (.OE)
    D FF
    INPUT MICRO
    CELL_ RD
    Figure 14. Input Micro
    Cell
    相關(guān)PDF資料
    PDF描述
    PSD835F3-A-12UI Configurable Memory System on a Chip for 8-Bit Microcontrollers
    PSD835F3-A-15B81 Configurable Memory System on a Chip for 8-Bit Microcontrollers
    PSD835F3-A-15B81I CAP 0.1UF 100V 10% X7R AXIAL MOLDED T&R R-MIL-PRF-39014
    PSD835F3-A-70U Configurable Memory System on a Chip for 8-Bit Microcontrollers
    PSD835F3-A-70UI Configurable Memory System on a Chip for 8-Bit Microcontrollers
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