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???
01/04/08 06:39
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 		 #149023 - Thanks/New Schematic
Responding to: ???'s previous message
Thanks for the explanation of the supervisor chip, makes sense. I went with a Microchip variant that the Andy posted above you, simply because the one you mentioned are not easily available from digikey.

From this document http://support.atmel.no/bin/custo...ntry&id=69
I have set up my ISP mode switches according to this quote:
On the AT89C51RD2, the PSEN pin shall be pulled low during a Reset to force In System Programming. In System Programming is done with Reset=0 while Reset must be maintain to high for ISP with AT89S52.


I put a momentary to allow for a manual reset, and another switch for pulling psen low as the document indicates to initiate programming mode. The only thing I'm not clear about on it is whether psen remains low during programming, and I'm struggling to find complete clear documentation of the chips ISP mode. For now I've put in a toggle for holding psen low...as that's my best guess from the general documentation I've found.

I've looked it over and I think I might have it right...or at least a lot better so I'm going to post a update and see if anyone has more advice or catches me making anymore stupid mistakes =).

http://ece.arizona.edu/~johnwill/DevBoard-Rev2.pdf

Thanks,
John




List of 56 messages in thread
TopicAuthorDate
8051 First time user schematic check            01/01/70 00:00      
   a perfunctionary check            01/01/70 00:00      
      And            01/01/70 00:00      
      suporvisor chip            01/01/70 00:00      
         re: Supervisor chip            01/01/70 00:00      
         go to maxim            01/01/70 00:00      
            Thanks/New Schematic            01/01/70 00:00      
               Supervisor Wrong            01/01/70 00:00      
                  You could have it wired up an running by now.            01/01/70 00:00      
                     and thus            01/01/70 00:00      
               the power LED has no series resistor            01/01/70 00:00      
               The MAX232 +10V Capacitor            01/01/70 00:00      
   Another hint            01/01/70 00:00      
      port 0 pins            01/01/70 00:00      
   startup project advise            01/01/70 00:00      
      Incrimental Stages....            01/01/70 00:00      
      thanks            01/01/70 00:00      
         a comment            01/01/70 00:00      
            Agree            01/01/70 00:00      
               why schematics???            01/01/70 00:00      
               lucky you            01/01/70 00:00      
   assembly            01/01/70 00:00      
      re SILabs devboards            01/01/70 00:00      
      yes, why not            01/01/70 00:00      
         suffer            01/01/70 00:00      
   check            01/01/70 00:00      
      even worse            01/01/70 00:00      
      Ground Symbol            01/01/70 00:00      
         beware of idiots            01/01/70 00:00      
            Great Example            01/01/70 00:00      
               PCB class            01/01/70 00:00      
               Agreed, but            01/01/70 00:00      
                  Advice for someone just starting            01/01/70 00:00      
            idiocracy            01/01/70 00:00      
         regarding ground vcc symbols            01/01/70 00:00      
   Serial port pins            01/01/70 00:00      
      reply to Esko            01/01/70 00:00      
         we are here to help            01/01/70 00:00      
      Thanks for the reply            01/01/70 00:00      
   you will have hard time...            01/01/70 00:00      
      serial port connections            01/01/70 00:00      
         serial port connections II            01/01/70 00:00      
            a vbery common mistake/confusion            01/01/70 00:00      
               ... plus the infinite variations...            01/01/70 00:00      
         Opinion            01/01/70 00:00      
            a comment on the comment            01/01/70 00:00      
               SPI            01/01/70 00:00      
   One more development card argument            01/01/70 00:00      
      sure, but do you get ICE functionality?            01/01/70 00:00      
         No ICE but wire wrap is OK            01/01/70 00:00      
            and so what            01/01/70 00:00      
               To learn ?            01/01/70 00:00      
                  learning - modifying SMT            01/01/70 00:00      
                     Bino microscope            01/01/70 00:00      
                        not to worry            01/01/70 00:00      
                        site showing how to solder/desolder SMT'S            01/01/70 00:00      

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