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    參數(shù)資料
    型號(hào): TMP320F2812ZHHA
    廠商: Texas Instruments, Inc.
    英文描述: TOOL ALIGNMENT PHILIPS CRMC 4IN1
    中文描述: TMS320R2811,TMS320R2812數(shù)字信號(hào)處理器
    文件頁數(shù): 124/147頁
    文件大?。?/td> 2021K
    代理商: TMP320F2812ZHHA
    Electrical Specifications
    124
    June 2004
    SPRS257
    6.27
    XHOLD and XHOLDA
    If the HOLD mode bit is set while XHOLD and XHOLDA are both low (external bus accesses granted), the
    XHOLDA signal is forced high (at the end of the current cycle) and the external interface is taken out of
    high-impedance mode.
    On a reset (XRS), the HOLD mode bit is set to 0. If the XHOLD signal is active low on a system reset, the bus
    and all signal strobes must be in high-impedance mode, and the XHOLDA signal is also driven active low.
    When HOLD mode is enabled and XHOLDA is active low (external bus grant active), the CPU can still execute
    code from internal memory. If an access is made to the external interface, the CPU is stalled until the XHOLD
    signal is removed.
    An external DMA request, when granted, places the following signals in a high-impedance mode:
    XA[18:0]
    XD[15:0]
    XWE, XRD
    XR/W
    XZCS0AND1
    XZCS2
    XZCS6AND7
    All other signals not listed in this group remain in their default or functional operational modes during these
    signal events. Detailed timing diagram will be released in a future revision of this data sheet.
    A
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