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???
02/25/06 00:45
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#110739 - It's always a tradeoff ...
Responding to: ???'s previous message
Even when the volume is low, cost-effectiveness is a factor, though perhaps not for those who are spending someone else's money. Sure, there's a tradeoff between "getting 'er done" and spending a "fortune," which can mean different things to different people. If I'm building something for an underfunded research fellow at the university I may not have the liberty of spending hundreds of dollars on components, even though it might reduce the effort. When I donate my time, I still don't donate materials.

Consequently, I'm not willing to go out and buy the most generously equipped "evaluation" or "development" boards for every purpose. The main reason, however, is that, in providing "features," they often rob you of options. If they use the serial channel for their monitor console function, then I can't use the serial channel in my target application.

That's the reason I don't like most "evaluation" boards.

For example, the board that Maxim wants us to use for evaluation of their DS89C4x0 MCU's has no feature enabling use of their much-touted page modes. That's the reason I built my own. My board presumably allows use of all the features, peripherals, etc, in the device, though it's always possible I might have missed something.

I'm using a monitor that uses the second serial port as the async link to the console. That way, if I need, I can use the first channel in my target app. If I use a different version of it, I can use an external SCC2691 and a 75155, the latter being a one-bit RS232-type receiver and transmitter. It works fine with +/- 5 volts, which, in this case, is readily available. That way I really don't ever have to choose between having serial comm with the console or other equipment or using the serial port pins for parallel port bits, for synchronous use, or for async. The SCC2691 has its own crystal, hence doesn't have any impact on what the MCU does.

RE

List of 49 messages in thread
TopicAuthorDate
UART not used or UART mode 0            01/01/70 00:00      
   me neither            01/01/70 00:00      
   mode 0            01/01/70 00:00      
   Maybe you'd best go back and reread ...            01/01/70 00:00      
      Well,            01/01/70 00:00      
   mode 0 totally different !            01/01/70 00:00      
      You're right, but what that means is ...            01/01/70 00:00      
         Why on earth?            01/01/70 00:00      
            You've lost me here ...            01/01/70 00:00      
               SPI meaning            01/01/70 00:00      
                  Yes, I knew that, but ...            01/01/70 00:00      
                     MODE 0 is "SPI"            01/01/70 00:00      
                        in fact            01/01/70 00:00      
               UART?            01/01/70 00:00      
               It is not about what you use.            01/01/70 00:00      
                  You give 'em what they want ...            01/01/70 00:00      
                     I never argued against using mode 0            01/01/70 00:00      
                        That was never a topic of discussion.            01/01/70 00:00      
                           you do not get it, do you            01/01/70 00:00      
                              Why is T2 able to do that if ...            01/01/70 00:00      
                                 This is getting real tiresome you keep r            01/01/70 00:00      
                                    Well ... maybe you should look at one            01/01/70 00:00      
                                       neither have I            01/01/70 00:00      
                                          It's the DA15 connector.            01/01/70 00:00      
                                             I have had enough vitamins            01/01/70 00:00      
                                                Oh! Now I get it ...            01/01/70 00:00      
                                                   I have said in virtually every post in t            01/01/70 00:00      
                                                      Async isn't the only way to do it.            01/01/70 00:00      
                                                         Oh boy            01/01/70 00:00      
                                                            What on earth is your definition            01/01/70 00:00      
                                                               what in the world does that matter?            01/01/70 00:00      
                                                                  can't have it both ways ...            01/01/70 00:00      
                                                                     I do not have illusions of grandeur and            01/01/70 00:00      
                                                                        OK ...            01/01/70 00:00      
                                                                           more oranges            01/01/70 00:00      
                                                                              It depends on where it fits            01/01/70 00:00      
                                                                                 Horsefeathers, there is nothing "relativ            01/01/70 00:00      
                                                                                    Not exactly ...            01/01/70 00:00      
                                                                                       Talking out of both sides of the mouth            01/01/70 00:00      
                                                                                          Consider this ...            01/01/70 00:00      
                                                                                             Just one thing, please, when stating thi            01/01/70 00:00      
                                                                                                It's always a tradeoff ...            01/01/70 00:00      
                           look forward, not backward !            01/01/70 00:00      
   Debugging            01/01/70 00:00      
      the ICEman cometh            01/01/70 00:00      
   Never mode 0            01/01/70 00:00      
      I think that's a narrow view.            01/01/70 00:00      
         what is narrow???            01/01/70 00:00      
   uart mode 0 application            01/01/70 00:00      

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