Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
08/24/08 17:44
Read: times


 		 #157707 - EA high not necessary during ISP
Responding to: ???'s previous message
"you haven't connected EA pin (pin 31) to Vcc, Asim khan's Circuit shows a 1K resistor between Vcc and pin 31."
>>The circuit which I did(the one which you have shown) is for my own code posted in previous post. When i tried Asim's circuit I did connect EA to VCC through 1K resistor.

I referred to the data sheet of AT89S51, EA should be strapped to VCC for internal programme execution. ISP section of the datasheet does not mention about the state of EA pin.
Please correct if I missed something.


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      

Back to Subject List