In some applications, using the 80C5xx/C5xx architecture, there is a need for more than64 kByte external program memory space. This request becomes more and moreimportant due to the increased usage of the high level language C51.The following apnote proposes a solution with a standard device 74HC257 used asexternal glue logic to solve the 64 kByte boundary problem for the external programmemory.1 Introduction32 Memory Organization 32.1 External Memory Organization in ´Normal Configuration´ 32.2 External Memory Organization in ´Expanded Configuration´ 43 Hardware Des cription 64 Software Proceeding for ´Expanded Configuration´ 85 Timing Considerations concerning the External Program Memory Access 96 Conclusion 10
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