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Problem in setting Double Clock using IAP calls

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vikrant

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hi all,

I want to program p89v51rd2 to double clock using IAP calls.

I am able to do Read , Write and Erase using IAP calls (CALL 01FF0H).
But when I want to enable double clock option by setting DPL = 0x05 and
R1 = 0x05 and calling CALL 01FF0H control is not coming back after this call. But same is working for Read,Write and Erase.

Can somebody let me know where i am doing wrong.
 

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