• KEYBOARD scanning
    I am developing an 8051 based keypad module. Problem i am facing is that program is scanning port very fast so that a simngle keypress will be taken as multiple presses. To over come this a delay was...
  • 8255 interface
    if some one trys searching the 8255 with 8051, many many basterds ARE WRITING MANY MANY THINGS BUT no one writes about the method howto do it with c and with keil. is any basterd there in this world...
  • How to scan strings from keyboard much clever?
    I want to scan string from keyboard and display on LCd ,but when scanning the next string ,the buffer for saving pre_string will be changed to the value in scanning buffer,and the display also will be...
  • Addressing 8255
    Hi, I have a Philips RD2 board with a memory mapped 8255 with ports A at 8000H, B at 8001H, C at 8002H and a control port at 8003H. How do I set up my defines so that I can just refer to these...
  • 8255 simulation
    Is it possible to simulate the 8255 by a plugin or anything else in keil µvision 2 ? Greetings Martin