Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
02/23/06 13:40
Read: times


 		 #110586 - YES!, I would not even dream of driving
Responding to: ???'s previous message
That suggests that you'd like 11.9808 MHz just fine as a UART crystal, and that's a handy rate for an NTSC-compatible CRT display with 16 lines of 64 characters, as is used on a number of machines.
I have deliberately switched from 11.0592 to "UART" crystal because I do not use that any more, I use faster clocks, but still "UART frequencies".

I just checked the KEIL rate calculator to make sure they both have 0% error ...
NO, I do not "like" 11.9808 MHz, with T1 it can only match to 4800 baud, which, today, is not acceptable.

and that's a handy rate for an NTSC-compatible CRT display with 16 lines of 64 characters, as is used on a number of machines. Now, if you had to stay in sync with that dot-clock, or UART crystal, or that, divided by 8 so as to avoid disrupting the display, would it be OK with you? Would you still prefer 11.059?
YES!, I would not even dream of driving such a display with a '51 that had to do other things as well, thus which frequency the "UART connected" unit runs at is irrelevant. BTW the displays I use have a 115k TTL level standard async interface.

Erik

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      

Back to Subject List