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

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
03/01/10 18:41
Read: times


 		 #173694 - It could be done with two wires and 2-UART MCU
Responding to: ???'s previous message
Erik Malund said:
Nowadays, nearly all the '52's have the second UART.
actually, it seems they do not; however with the abolishment of the 51/52/... distinction many '51 versions do. It seems that any derivative that goes more than a bit past the traditional '52 is named a '51

Gee ... I hadn't run into that ... I always (at least in recent decades) have thought of the '51 as the guy with fewer resources ...

It's odd that the eval boards don't support it.
the issue is not that they "don't support it" but that only one transceivers is there.

Well, I did point out one really cheap ($40q1) board that has both types of transceivers, yet only one UART on the "stock" '51. Two added wires would fix that, of course, if you plugged in a PLCC-44-packaged MCU with two UARTs on board. You then simply set the jumpers to provide the transceiver you want associated with the first UART and connect the two wires from the second UART to the opposite position in the jumper set.

Erik



List of 83 messages in thread
TopicAuthorDate
ready made board with 2 UARTs equipped ..            01/01/70 00:00      
   Send me details            01/01/70 00:00      
   SiLabs kit            01/01/70 00:00      
      they don't, but            01/01/70 00:00      
   Can you give more details ?            01/01/70 00:00      
      if it was to be made, I need no assistance since ...            01/01/70 00:00      
         ...and I thought Price was the issue...            01/01/70 00:00      
   One Suggestion            01/01/70 00:00      
      the MX chips are being phased out            01/01/70 00:00      
   I sent you email            01/01/70 00:00      
      read, answered, thanks            01/01/70 00:00      
   you can use sm5964            01/01/70 00:00      
      the idea was stated as...            01/01/70 00:00      
         It is a suggestion            01/01/70 00:00      
            Not a good idea            01/01/70 00:00      
            that it is            01/01/70 00:00      
   How about Phycore?            01/01/70 00:00      
      Legacy Product            01/01/70 00:00      
         oh, yes            01/01/70 00:00      
            Have a look at grifo            01/01/70 00:00      
   This looks good too            01/01/70 00:00      
   I've been wondering ...            01/01/70 00:00      
      Likewise            01/01/70 00:00      
         Maybe, but who makes 'em?            01/01/70 00:00      
            8052 with only 1 UART            01/01/70 00:00      
               I'm surprised, but that's the case!            01/01/70 00:00      
                  why surprised?            01/01/70 00:00      
                     That's what I thought            01/01/70 00:00      
                     I never thought of it in those terms ...            01/01/70 00:00      
                        comments            01/01/70 00:00      
                           It could be done with two wires and 2-UART MCU            01/01/70 00:00      
      120 devboards ...            01/01/70 00:00      
         How difficult or costly would it be to add one?            01/01/70 00:00      
            neither difficult nor costly            01/01/70 00:00      
         SILABs 040 has 2 uarts on it            01/01/70 00:00      
   with ds89c450 or 430            01/01/70 00:00      
      But that's a chip - not a board!            01/01/70 00:00      
         cheap boards            01/01/70 00:00      
            this is what's meant            01/01/70 00:00      
               No RS485            01/01/70 00:00      
                  Example            01/01/70 00:00      
                     bad example            01/01/70 00:00      
                        No - excellent example!            01/01/70 00:00      
                           likewise with that other board ...            01/01/70 00:00      
                           And did *you* know what are you looking for?            01/01/70 00:00      
                              You got it            01/01/70 00:00      
                  why "never"?            01/01/70 00:00      
                     the PC's not the best example ...            01/01/70 00:00      
                        PC as an example            01/01/70 00:00      
                           Lots of toys ... little of any practical use.            01/01/70 00:00      
                              Different tools can be used in different ways            01/01/70 00:00      
                                 where is your head wedged?            01/01/70 00:00      
                                    Don't blame the PC for solving wrong things with USB            01/01/70 00:00      
                                       There are many things for which USB is unsuited            01/01/70 00:00      
                                          Every change since 1980 isn't for the worse            01/01/70 00:00      
                                             Maybe, but this one is            01/01/70 00:00      
                                                again            01/01/70 00:00      
                                                   Thta's what you say ...            01/01/70 00:00      
                                                      that's what you always say            01/01/70 00:00      
                                                         Where you sit determines what you see            01/01/70 00:00      
                                                            Where did you sit?            01/01/70 00:00      
                                                   SPI solves completely different problem than HDLC            01/01/70 00:00      
                                                and again            01/01/70 00:00      
                                                   what about the required size of the driver?            01/01/70 00:00      
                                                      required size of driver            01/01/70 00:00      
                                                         What do you mean by PCL Cost?            01/01/70 00:00      
                                                            price difference between similar printers -            01/01/70 00:00      
                                                Define narrow view - I see oportunities, i.e. the reverse            01/01/70 00:00      
                                                   not relevant            01/01/70 00:00      
                                                      So the Windows driver didn't list 8051 compatibility???            01/01/70 00:00      
                                          I vote Richard as president for ...            01/01/70 00:00      
                                             That's what one would expect from you, Erik            01/01/70 00:00      
                              USB and fixed-rate transfer            01/01/70 00:00      
                                 Fortunately, there's DOS ...            01/01/70 00:00      
                        Linux - I thought as much            01/01/70 00:00      
                        PCs            01/01/70 00:00      
                           you forgot about LINUX            01/01/70 00:00      
   By this time, anybody could have built one...            01/01/70 00:00      
      Funnily enough, ...            01/01/70 00:00      
      no            01/01/70 00:00      
   I Hate to ask this....            01/01/70 00:00      
      A *very* common requirement!            01/01/70 00:00      
      if indeed            01/01/70 00:00      

Back to Subject List