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???
02/20/06 15:36
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 		 #110338 - in fact
Responding to: ???'s previous message
hi,
Erik Malund said:
The only use I know of for mode 0 is SPI, the signals are identical if you strip the "extra bit".

Well, once I have already said about UART mode 0 vs SPI. They are similar but the main difference is signal timings.

SPI defines that a data bit is put on data line at the one edge of SCK then latched at the opposite edge. Then data bit is still kept on data line until the next "shift" edge comes in.

UART mode 0 called "shift register" works with another way. It defines that a data bit is clocked in/out at the same edge.
In fact, classic 8051 MCU shifts data in some time before rising edge (-2T) and shifts data out in some time after rising edge (+2T), where 12T is the shift period of a bit.

So these timings may be took in consideration especially at high bitrates of UART mode 0.

Regards,
Oleg

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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