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  • accessing 8051 internal expanded memory
    I am working to port older code to an Atmel AT89C51AC3, I have the system basically running but have run out of data space while tweaking the code to handle timing constraints. The AT89C51AC3 has 2048...
  • No expanded RAM access with P89V664
    I am unable to access expanded RAM, despite the following: I set AUXR to 2 during startup; PSEN is tied high; all expanded RAM access is via DPTR. Nonetheless, using my little LCD program,...
  • run code from xdata (internal ram)
    I want to run a short function from internal xdata! I use the DS80C390, I use the configuration with my internal xdata on 00F000h–00FFFFh and no external xdata. I have 128k code space. IDM =...
  • XDATA for SILabs internal xdata EMI0cn
    how do I specify in C that xdata access is to use EMI0CN instead of P2 for high byte of address xdata access