• xdata &expanded ram( xram)
    friends,i have interfaced 512k nvram to 89c668 (philips) but i dont know how to declare variables to xdata and xram.Is there any keyword to define variables seprately in xdata and xram at compile time...
  • 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...
  • Watchdog behaviour P89V664
    The P89V664 has an abnormal watchdog behaviour: 1) Enable watchdog -> ok 2) Serve the watchdog -> ok 3) Don\'t serve the watchdog: - Reset condition is detected (5us high on RST @18MHz) - Device...
  • watch dog tomer in p89v664
    Hi, Could any one tell me how to initialize p89v664 watchdog timer? regards nag
  • The internal expanded RAM(XDATA) on AT89C51RB2 cannot be used
    Hello everybody, I am testing a program for AT89S54(AT89C51RB2) with uVision2.As you konwn,this chip has 768 bytes expanded RAM(XRAM).I want to use the XRAM for my program,but the XRAM space cannot be...