• Why I can access the xdata memory 0x38000 to 0x3FFFF but can't access 0x28000 to 0x2FFFF?
    I extend the off-chip xdata memory up to 128k, and code memory 128k. But when I access xdata 0x28000 to 0x2FFFF, the MCU(w77c32) is reseted. How can I do to resolve the problem?
  • Why I can access the xdata memory 0x38000 to 0x3FFFF but can't access 0x28000 to 0x2FFFF?
    I extend the off-chip xdata memory up to 128k, and code memory 128k. But when I access xdata 0x28000 to 0x2FFFF, the MCU(w77c32) is reseted. How can I do to resolve the problem?
  • Problem in accessing Data Memory using FVAR : Need HELP!!
    Hello! We have a DS80C400 based system. We have a CPLD which has chip-select based on some Address lines and PCE0#. The CPLD uses RD# and WR# lines instead of PSEN# and WR#. We have configured...
  • Problem in accessing Data Memory using FVAR : Need HELP!!
    Hello! We have a DS80C400 based system. We have a CPLD which has chip-select based on some Address lines and PCE0#. The CPLD uses RD# and WR# lines instead of PSEN# and WR#. We have configured...
  • xdata access, how ?
    Dear sir, i am is a student in physic department,i use uVision IDE for 8051 ver 6.20c, build a single board computer, with core is AT89S52,one Dallas RTC 12C887,and an 8255 PPI, both (RTC & PPI) connected...