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AT27C520 EPROM用作AT89XXX系列微控制器的

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The Atmel AT27C520 EPROM, with its64K Bytes of storage, combined with anovel multiplexed address/data schemeand an internal latch pin, make it theideal External Program Memory storagesolution for the Atmel AT89XXX Micro-Controller family. A simple scheme canbe constructed where the AT89XXX P0port serves as both the lower orderaddress byte (to the EPROM) as well asthe data bus (from the EPROM), whilethe P2 port serves as the high orderaddress byte (to the EPROM). Additionally,the AT27C520 can be accessed inless than 90 nS. max. eliminating wastefulwait states. Figure 1 shows the necessaryblock diagram. Table 1 containsthe necessary interface connections.
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