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???
08/11/08 05:10
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 		 #157388 - AT89S5X or DS89C450MNG
Responding to: ???'s previous message
>I am new to practical microcontrollers. To start with I want >to flash a small program into 89s51 to turn on and off a LED >with 5s delay. I need a simple schematic using parallel port >or serial port. Also a schematics for simple developmemt >board. The schamatics I got from Atmel's website is little >complicated and am not able to find a proper one in net. I >have good theoritical knowledge on microcontrollers and >electronics. Pls help me to start working with it.

follow the Ks whichit siricote description..when used old PC(P1-3)..
when parallel port signal below 5 V.(such as Laptop)
then used 74HC244 or similiar with HC as buffer..for ISP programmer..

JBJ


List of 34 messages in thread
TopicAuthorDate
Programming 8051/8052            01/01/70 00:00      
   Get something ready to do to start...            01/01/70 00:00      
   here's a simple ISP cable for 89S51/2            01/01/70 00:00      
      ... and HOPE            01/01/70 00:00      
    or DS89C450            01/01/70 00:00      
      Not the fastest by 3::1            01/01/70 00:00      
         There are features ...            01/01/70 00:00      
            Pray explain            01/01/70 00:00      
               Some features really DO help            01/01/70 00:00      
                  why fiddle with MODE 0            01/01/70 00:00      
                     There aren't many reasons, but SPI isn't one            01/01/70 00:00      
                        you are describing SPI            01/01/70 00:00      
                           Have a look!            01/01/70 00:00      
                              luvverly !            01/01/70 00:00      
                                 ... and what I really like ...            01/01/70 00:00      
                                    nope            01/01/70 00:00      
                                       You missed a thing or two, Erik            01/01/70 00:00      
    i edit my answer as            01/01/70 00:00      
   AT89S5X or DS89C450MNG            01/01/70 00:00      
   Back to Topic-here is what I tried for days..            01/01/70 00:00      
      two mistakes            01/01/70 00:00      
      Logic Low Levels?            01/01/70 00:00      
      please consider            01/01/70 00:00      
         Abt ISP cable ang voltage level            01/01/70 00:00      
            That how most of these posts go            01/01/70 00:00      
               schematics at last!            01/01/70 00:00      
                  no, the frequency does not matter            01/01/70 00:00      
            Maybe a helpful link            01/01/70 00:00      
            Where you measure the voltage makes a difference            01/01/70 00:00      
               ISP Schematics at last!            01/01/70 00:00      
                  Keep your work clean and wires short            01/01/70 00:00      
                  See if this suits you...            01/01/70 00:00      
      EA pin should be high            01/01/70 00:00      
         EA high not necessary during ISP            01/01/70 00:00      

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