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???
07/26/05 09:50
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 		 #98125 - ISP is more straighforward
Responding to: ???'s previous message
Craig Steiner said:
What's the point of special cables when we already have a perfectly good RS-232 standard going?

I already mentioned the point - SPI-ISP can be (and is) implemented in hardware, while the more human-oriented UART protocols don't. So the SPI is conceptually closer to the traditional programming; in fact, it is "only" an extension (an attached shift register) to the parallel programming circuitry. On the other hand, the UART-ISP relies on some software (firmware) running in the controller; so it can have (and does have) errors as any other software; and also the method of its invocation (under various circumstances, wanted or unwanted, etc.) is an issue.

Note, that Philips in the LPC9xx-series (at least in the bigger parts) implemented both UART- and SPI-ISP (and parallel programming, too).

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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