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???
07/27/05 13:25
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 		 #98275 - alternative UART-ISP entry
Responding to: ???'s previous message
There is no considerable risk of set the ISP entry on UART event, if you have full control over what can occur on the UART.

For example, if there is a HDLC-like framing employed and the ISP-entry is bound to properly framed checksummed etc. packet of a particular content, there is no risk whatsoever.

But this does not apply generally; that's why the manufacturers came up with more straighforward solutions (pin pulldown).

The "held pin" can be of course tied to handshake signals for "touchless" operation (as it is in the 8052.com.SBC), but again, one has to be sure the "counterpart" on the communication line will never use them.

Jan Waclawek

List of 54 messages in thread
TopicAuthorDate
Unale to Program the AT89S52 TQPF in sys            01/01/70 00:00      
   cable seems too long            01/01/70 00:00      
      Cable ?            01/01/70 00:00      
      Crosstalk?            01/01/70 00:00      
         me too and same result            01/01/70 00:00      
            Modifications...            01/01/70 00:00      
               Tank you very much Kai            01/01/70 00:00      
         my hesitance            01/01/70 00:00      
      Problem Solved :)            01/01/70 00:00      
         Bah,            01/01/70 00:00      
            Wow !            01/01/70 00:00      
            i suspected that....            01/01/70 00:00      
   Coul someone send mo ISP_Programer30a            01/01/70 00:00      
      if you took the time to read            01/01/70 00:00      
         He is asking about ISP            01/01/70 00:00      
            if you need a programmer, you are not do            01/01/70 00:00      
               depends what you call a programmer            01/01/70 00:00      
                  standard signals            01/01/70 00:00      
                     The moon is...            01/01/70 00:00      
                        nice point ;)            01/01/70 00:00      
                        last I looked            01/01/70 00:00      
                           Programmers vs cables            01/01/70 00:00      
                              all is relative            01/01/70 00:00      
                                 Kitchen table programmers            01/01/70 00:00      
                                    additionally            01/01/70 00:00      
                                 SPI-ISP vs UART-ISP            01/01/70 00:00      
                                    bit bang and one button            01/01/70 00:00      
                                       programmer            01/01/70 00:00      
                                          no technician needed            01/01/70 00:00      
                                             was the PDA/laptop free?            01/01/70 00:00      
                                                yes, the PDA/laptop was free            01/01/70 00:00      
                                                   I have seen boxes for configuration            01/01/70 00:00      
                                                      free or "cost you nothing"            01/01/70 00:00      
                                                         summary?            01/01/70 00:00      
                                                            sure            01/01/70 00:00      
                                                Neat            01/01/70 00:00      
                                                   Thanks            01/01/70 00:00      
                                    I agree with this            01/01/70 00:00      
                                       ISP is more straighforward            01/01/70 00:00      
                                          hardware is no garantee            01/01/70 00:00      
                                             sure            01/01/70 00:00      
                                                Not so sure            01/01/70 00:00      
                                                   ISP: SPI vs UART continued...            01/01/70 00:00      
                                                      True but...            01/01/70 00:00      
                                                         I know of none            01/01/70 00:00      
                                                            Do you mean            01/01/70 00:00      
                                                               re kicking and screaming            01/01/70 00:00      
                                                               issues...            01/01/70 00:00      
                                                                  Still sounds like entering ISP problem            01/01/70 00:00      
                                                                     my lengthy posts are boring            01/01/70 00:00      
                                                                     entry of ISP            01/01/70 00:00      
                                                                        alternative UART-ISP entry            01/01/70 00:00      
                                    Kitchenware is what isn't thorougly deve            01/01/70 00:00      
                                       somehow the UART method has escaped all            01/01/70 00:00      

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