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External memory interfacing with 8051

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vinothksr08

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hello,

I have to store my program in external memory and run from that(even i have internal program memory). am using at89c51, keil c compiler, can anybody give some idea.?
 

you can use "MOVX" instruction to store ur code in external mem ,BUT with "movx" instruction you'll ave to use DPTR or P0 as pointer..
eg : MOVX @DPTR,A ;
 
thank you jayanth,

i got idea about interfacing external memory. like wise how to interface SRAM & DRAM with 8051. and how to write to & read from that? and also could you explain the function of 74LS373 in that circuit?
 
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