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Recent content by saraheem

  1. S

    using ext. interrupt in at89s51

    Thank u IanP... asked because earlier while doing it in breadboard i had to connect the ext int0 to Vcc to avoid it from going into the isr. Now it is having 5V(hi) after the initial reset on power up. Before reset its 0...
  2. S

    using ext. interrupt in at89s51

    Hi... I am using AT89S51 uC. My proj requires the use of the external interrupt Int0 (pin 12 in the IC). My doubt is: After switching on the power supply and resetting the circuit the Int0 pin goes hi automatically (Before reset the pin is low). But when i first implemented this on the bread...
  3. S

    Help me with a program for Linx kh2 transmitter and receiver

    Hi... I am using at89s51 uC. For wireless link i am using linx kh2 transmitter and its corresponding kh2 receiver. In writing the program for this setup, i need to know when exactly i should read the data. The Rx ic gives a data valid signal(VT) when there is a valid transmission. I am...
  4. S

    integrating uC 89s51 with wireless link using linx kh2

    Hi... I am using at89s51 uC. For wireless link i am using linx kh2 transmitter and its corresponding kh2 receiver. In writing the program for this setup, i need to know when exactly i should read the data. The Rx ic gives a data valid signal when there is a valid transmission. I am giving this...
  5. S

    Waveform at xtal2 pin of AT89S51

    Hi IanP... Thank you for confirming that... I was doubtful since i had trouble programming it earlier...
  6. S

    Waveform at xtal2 pin of AT89S51

    Hi... I am using AT89S51 uC. When i connected the circuits as per the schematics in one website, i got a sinusoidal waveform at xtal2 pin of the uC. Is it correct??? Or should i be getting a square wave? Also that schematic didn't use any parallel capacitors between the xtal 1 & xtal2 pins as...
  7. S

    How to return to a particular line after ISR is executed???

    I am using AT89s51 and programming with embedded C (Keil uVersion4 demo version). I am writing a program that has a number of routines of which one is called sig_ctrl(). I am also using Interrupt 0 in my proj. My question is this: After the ISR is executed i want my program to ALWAYS...
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