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???
06/22/06 20:00
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 		 #118884 - SPI??? Is that in the "bible"
Responding to: ???'s previous message
A UART is incapable of SYNCHRONOUS communication. There are USRT's of various types, and there are USART's, e.g. i8251 (of which the 805x serial port is not one). Now, some UARTs can be persuaded to transmit in isochronous mode. That's where you transmit start-bit, data bits, parity (if used), stop bit(s) continuously, as a UART with a FIFO can readily do. It still loses the overhead bits. That could be as many as 12 bits to transport 8 data bits. That means that you COULD cut back on bandwidth in order to achieve higher efficiency. So long as it doesn't cost extra, I doubt it matters.

RE



List of 34 messages in thread
TopicAuthorDate
74hc595/597 connection with c51            01/01/70 00:00      
   Any available port pin            01/01/70 00:00      
   I'd suggest you read the datasheet            01/01/70 00:00      
      little more info as u require richard            01/01/70 00:00      
         start it simple and stupd            01/01/70 00:00      
   bit-bang            01/01/70 00:00      
      problem is ...            01/01/70 00:00      
         talking about standard '51...            01/01/70 00:00      
            That's why I want to "fix" it ...            01/01/70 00:00      
         there is'nt so why do you proselytize f            01/01/70 00:00      
            PC's are async, Mode-0 is not            01/01/70 00:00      
               I know that, but 99.17% of all '51 UART            01/01/70 00:00      
                  Do you know what UART means?            01/01/70 00:00      
                     A resounding NO. I use synchrono            01/01/70 00:00      
                        SPI??? Is that in the "bible"            01/01/70 00:00      
                           no, it is not - but it is a very well de            01/01/70 00:00      
                              You're well into nonsense, now, Erik            01/01/70 00:00      
                              you just ignore the real reason            01/01/70 00:00      
                                 This may be a valid topic, but not here.            01/01/70 00:00      
                                    Whenever you use shift registers for I/O            01/01/70 00:00      
                                       Doesn't SPI have a bunch of "features?"            01/01/70 00:00      
                                          yes, we ARE mixing, both threads touch s            01/01/70 00:00      
                                             I don't want to confuse the O/P ...            01/01/70 00:00      
                                                that would be wrong            01/01/70 00:00      
                                                   I think we've lost the O/P            01/01/70 00:00      
                           this may be the answer to your 'prayers'            01/01/70 00:00      
                              Thanks, but which prayers are those?            01/01/70 00:00      
                                 those for a fast synchronous communicati            01/01/70 00:00      
                                    I don't want to use a commercial chip            01/01/70 00:00      
                                       why not            01/01/70 00:00      
                                          If I want to use SPI, I'll build it in            01/01/70 00:00      
                  Do you know what UART means?            01/01/70 00:00      
                     ^%$#@! I didi it again!            01/01/70 00:00      
   Depends on your needs...            01/01/70 00:00      

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