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???
02/06/07 14:36
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 		 #132133 - An easier way?
Responding to: ???'s previous message
Mike Stegmaier said:

The parallel port is the easiest way to transfer a byte from the computer to the outside world. I want an easy way to program my EEPROM in my system, so I will use the parallel port.

If you write a small bootloader and von Neumann-wire an EEPROM or two that supports RAM-style writing in system (such as an AT28C64B or a AT2864E), you could achieve in-system programmability without any form of clock gating or other complexities.

If I used USB or serial, then I have to deal with timing and data synchronization issues.

Under a scheme like I've just suggested, you could use the 8051's internal UART for serial data transfer, and there wouldn't be much difficulty involved. As an added bonus, you wouldn't have to deal with PC parallel port programming.

Just a thought.

--Sasha Jevtic

List of 45 messages in thread
TopicAuthorDate
CMOS?            01/01/70 00:00      
   74HC and 74HCT IS CMOS!            01/01/70 00:00      
      yes            01/01/70 00:00      
         a datasheet and a calculator            01/01/70 00:00      
   Why do you want to "process the PSEN signal" I kno            01/01/70 00:00      
      You need to stick your nose in the books, Mike            01/01/70 00:00      
         umm.            01/01/70 00:00      
            WHAT are you doing with the PSEN ?            01/01/70 00:00      
               programmer + system            01/01/70 00:00      
                  80C51BH doesn't have EPROM            01/01/70 00:00      
                     He's using it as an 80C31            01/01/70 00:00      
                     im meant            01/01/70 00:00      
                  Ambiguous            01/01/70 00:00      
                     LPT            01/01/70 00:00      
                        Is it T0 and T1, or T1 and T2?            01/01/70 00:00      
                           T0 and T1 and, for a '52 T2            01/01/70 00:00      
            What do you mean \"ummm\"            01/01/70 00:00      
               welcome to "Trying"            01/01/70 00:00      
                  nobody thinks you're stupid, however ...            01/01/70 00:00      
                     answer.            01/01/70 00:00      
                        why screw with the clock?            01/01/70 00:00      
                           stop trying to make deals!            01/01/70 00:00      
                              not necessarily            01/01/70 00:00      
                                 ok            01/01/70 00:00      
                                    sorry, I goofed            01/01/70 00:00      
                              Because...            01/01/70 00:00      
                                 Yes, but will it work? It's ATMEL ... (yechhh!)            01/01/70 00:00      
                                 Just to play it safe            01/01/70 00:00      
                                    or try the Maxim/DALLAS parts ...            01/01/70 00:00      
                                       BINGO            01/01/70 00:00      
                                       Not a good first chip            01/01/70 00:00      
                                          What's his primary purpose            01/01/70 00:00      
                                       Mike - FREE CHIP            01/01/70 00:00      
                        An easier way?            01/01/70 00:00      
                           if he is to get another chip, then            01/01/70 00:00      
                              Harder than it needs to be            01/01/70 00:00      
                                 Let him do what he wants! He'll learn something.            01/01/70 00:00      
                                    a small correction            01/01/70 00:00      
                                       Well, I wouldn't know ... I don't use ATMEL            01/01/70 00:00      
                                    answers....            01/01/70 00:00      
                                       TOTALLY and ABSOLUTELY incorrect. if "the flash            01/01/70 00:00      
                                          .            01/01/70 00:00      
                                             Mike ,,, there are other problems ...            01/01/70 00:00      
                        There may be some surprises ...            01/01/70 00:00      
               two Timers            01/01/70 00:00      

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