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    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,...
  • 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...
  • 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...
  • how to expand pwm pins?
    Hi i'm a beginner in MCUs world . i'm facing some issues ... in LPC17XX datasheet there are 6-output general purpose PWM available in LPC1768 I'm planning to use 7 PWM pin to control the speed of...
  • Defining variables for internal memory (8051)
    Can anyone pls help me in writing the following lines in C Var1 DATA 40h org 0100h mov A,#45h mov Var1,A END thanks, Lina