• simulating external memory with out P2 addressing
    I'm trying to simulate a simple design (written in assembler), in uVision4, that has a few memory mapped peripherals and uses P2 for GPIO. In "options for target" I set "Off-chip Ddata memory" to: Start...
  • using External Memory Addressing on DS80C390 with Chip Enables
    Hello, I am writing code for a PCB with a DS80C390 to assert ~PCE1 via xdata memory accesses so I can read/write to the registers of a UART on a piggy-back board. I have set the Port 4 Control Register...
  • External memory
    hello, i've declared an external memory mapped at address 8000H, and load data into it : unsigned char xdata xdisp[15][24] _at_ 0x8000; unsigned char i; for (i = 0; i < 16; i++) { xdisp[i][0] ...
  • EXternal Memory.
    I am using Cygnal controller C8051F005 which has on chip external 2K memory. I defined one array as follows. xdata char mydata[1440]_at_0x97; In mydata array I am storing my data. But I observe that...
  • External Addressing
    I want to make a two object file & want that both should declared at different locations as per our requirment so can any one tell how we declared a function at an external address