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    AT27C520 EPROM用作AT89XXX系列微控制器的

    资料大?。?/em> 333

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    上传日期: 2009-05-19

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    The Atmel AT27C520 EPROM, with its
    64K Bytes of storage, combined with a
    novel multiplexed address/data scheme
    and an internal latch pin, make it the
    ideal External Program Memory storage
    solution for the Atmel AT89XXX Micro-
    Controller family. A simple scheme can
    be constructed where the AT89XXX P0
    port serves as both the lower order
    address byte (to the EPROM) as well as
    the data bus (from the EPROM), while
    the P2 port serves as the high order
    address byte (to the EPROM). Additionally,
    the AT27C520 can be accessed in
    less than 90 nS. max. eliminating wasteful
    wait states. Figure 1 shows the necessary
    block diagram. Table 1 contains
    the necessary interface connections.

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