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???
02/15/06 19:46
Modified:
  02/15/06 19:48
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 		 #110094 - again, why not 11.0592 ?
Responding to: ???'s previous message
Richard Erlacher said:
If it's POSSIBLE to use 12 MHz as the timebase for serial communication, and it's EASY to perform software timing with a 1 microsecond instruction cycle, that's convenient.


But whats the reason to do so ?

I use also the nice 11.0592MHz crystal, since I use the UART and wont always the highest speed (57.6kBaud).

No other task need a certain crystal, so I see absolutely no reason to use not 11.0592MHz.

E.g. SW-RTC, frequency meter and so on are working with the same precision fully independend from the crystal value.

Most math was done by the compiler preprocessor, so there is absolutely no difference in convenience.


The lowest possible baud rate at 11.0592MHz is:

11.0592MHz / 12 / 32 / 65536 = 0.44Baud


Peter


List of 90 messages in thread
TopicAuthorDate
does anybody use those "low" baud rates?            01/01/70 00:00      
   I think            01/01/70 00:00      
      I use even low            01/01/70 00:00      
      but I want REAL information            01/01/70 00:00      
   OBDII            01/01/70 00:00      
      Interesting ... Was that standard ASYNC            01/01/70 00:00      
         srry here is the full story            01/01/70 00:00      
   Water level            01/01/70 00:00      
      Is that in ASYNC format?            01/01/70 00:00      
         why not 11.0592/22.1184MHz?            01/01/70 00:00      
            serial timing isn't always as important            01/01/70 00:00      
               comments            01/01/70 00:00      
                  Well ... that's not entirely true ...            01/01/70 00:00      
                     precise???            01/01/70 00:00      
                        Inconvenience            01/01/70 00:00      
                           IF there's another way ...            01/01/70 00:00      
                              forget mode 0, im that mode there is no            01/01/70 00:00      
                                 Not the ones I see ...            01/01/70 00:00      
                              again, why not 11.0592 ?            01/01/70 00:00      
                                 if you don't like the 11.0592MHz...            01/01/70 00:00      
                                    Well, if they do 24, why not use that?            01/01/70 00:00      
                                 I see your point, but ...            01/01/70 00:00      
                                    Do I miss something??            01/01/70 00:00      
                                       Excitement? I'm not excited ...            01/01/70 00:00      
                                          why do you keep stating "sacred", it is            01/01/70 00:00      
                                             Right Erik !            01/01/70 00:00      
                                                It's because of the purpose            01/01/70 00:00      
                                                   And if that is out of the question use            01/01/70 00:00      
                                             Still none the wiser            01/01/70 00:00      
                                             it's that ASR33 rate that bugs me ...            01/01/70 00:00      
                                                not the statements, the "universalism"            01/01/70 00:00      
                                                   Re: not the statements, the "universalis            01/01/70 00:00      
                                                      Yes, as I said, it's convenient ...            01/01/70 00:00      
                                                         if you use (as you yourself state to pre            01/01/70 00:00      
                                                            It's been shown            01/01/70 00:00      
                                                               Of course it is            01/01/70 00:00      
                                                                  It's hard to argue ...            01/01/70 00:00      
                                                                     Then buy it, or even better, have one on            01/01/70 00:00      
                                                                        I'll buy 'em when there IS such a thing            01/01/70 00:00      
                                                                           misapplied economy            01/01/70 00:00      
                                                                              The $2 board was fully assembled            01/01/70 00:00      
                                                                                 again you talk about oranges            01/01/70 00:00      
                                                               Because reliability !            01/01/70 00:00      
                                                                  Seems interesting ...            01/01/70 00:00      
                                                                     only 24Mhz can be get            01/01/70 00:00      
                                                                        True, for sure,            01/01/70 00:00      
                                                                     apples and oranges            01/01/70 00:00      
                                                                        If that's true, then something's broken            01/01/70 00:00      
                                                                           a slight correction            01/01/70 00:00      
                                                                              You're right, of course,            01/01/70 00:00      
                                                                                 actually you did            01/01/70 00:00      
                                                                              further correction            01/01/70 00:00      
                                                                                 That's up to you ...            01/01/70 00:00      
                                                                                    I do not know where you get that impress            01/01/70 00:00      
                                                                                       One thing at a time ...            01/01/70 00:00      
                                                                                          no            01/01/70 00:00      
                                                                                             so you talk to that stuff directly            01/01/70 00:00      
                                                                                                as to "what I do"            01/01/70 00:00      
                        That's not quite true ...            01/01/70 00:00      
         8048?            01/01/70 00:00      
            You're right, it's not            01/01/70 00:00      
               have a look            01/01/70 00:00      
                  It's not obvious what you mean, Erik            01/01/70 00:00      
                     no, not that            01/01/70 00:00      
                        Close, perhaps, but no cigar ...            01/01/70 00:00      
                           SPI rather than I2C            01/01/70 00:00      
                              the full story            01/01/70 00:00      
                                 I2C, SPI, parallel, whatever            01/01/70 00:00      
                           poll a bit            01/01/70 00:00      
               '51 descendant of 8042            01/01/70 00:00      
                  The one on the KEIL page is too big ...            01/01/70 00:00      
                     CPLD            01/01/70 00:00      
                        I did sumfin like that            01/01/70 00:00      
   Specialist transmission only            01/01/70 00:00      
   EVA-DTS over DDCMP            01/01/70 00:00      
      simulator Fun            01/01/70 00:00      
   A "Why" for low speed modems            01/01/70 00:00      
   Low baud rate            01/01/70 00:00      
   Bill Acceptors            01/01/70 00:00      
      well ... clearly there are some places            01/01/70 00:00      
   doesn't ring true ...            01/01/70 00:00      
      which one?            01/01/70 00:00      
         here:            01/01/70 00:00      
            oh no            01/01/70 00:00      
               OK ... no big deal            01/01/70 00:00      
                  YES!, I would not even dream of driving            01/01/70 00:00      
                     Well, I did that            01/01/70 00:00      
                        not every application can "take a pause"            01/01/70 00:00      
                           Believe it or not, I agree ...            01/01/70 00:00      
                              wow            01/01/70 00:00      

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