• IAP access with Phillips P89C668
    I'm using a Philips P89C668 that provides In-system Application Programming (IAP) with have an entry address at 0xFFF0. Is there a clever way to access the IAP functions directly from C without the need...
  • Issues with External RAM and xdata declaration ...
    Hi guys, I have my code defined in the uVision interface as LARGE and the memory model as SMALL, however, if I try to run the program with the memory model LARGE the program does not run (if everything...
  • how does the c51 compiler initialise those varibles declared in XDATA area?
    hi I want to konw how the c51 compiler initialises those varibles declared in XDATA area? such like : unsigned char xdata var1 - 0x55; thanks!
  • The ram area map in the link
    Dear all, In my project,the internal ram is limit,but some state the ram can overlay,How can define the compiler or link option?such as following. +----------+ | area 1 | stateA | | | | ...
  • interfacing a P89C668 microcontroler with a anybus compactcom module
    Hello I'm making a career end project, and i've got to make a succesfull communication between the philips p89c668 microcontroller (8kb xram, 64 kb rom) and an anybus compactcom module to get fieldbus...