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Hi: I find the same question I meeted. But I don't understand the content as followed... ..................................... 3. Add the following instruction (ANL 0B1h, #01h) at the beginning of the startup code (BEFORE XDATA is cleared). ..................................... ANL 0B1h, #01h ??? Thanks for any reply.
Probably refer to clearing a bit in a SFT that control the source of XDATA for the addresses where external and internal XDATA both exist. (internal XDATA, do'nt you love it) I suggest EDATA for extended data as the name for this. Now my question: you have an existing design with external RAM mapped from 0000. To gain a bit more RAM withou modifying the hardware, you pop a chip with some EDATA memory in. QUESTION: How do you define which variables are in XDATA and which in EDATA since the addresses are the same - and how do you specify the switch the thread originatot talks about (I know that e.g. Winbond and Philips use different mechanisms). Have fun, Erik