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???
04/10/06 12:16
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 		 #113961 - a LPC
Responding to: ???'s previous message
Which external UART would YOU recommend with his 80C51?
I'd use a LPC, that way you can offload the low level processing. Besides a LPC is cheaper than an external UART.

Now, for the actual problem of a non-51 type transmission, if you bitbang an external LPC there is no processing overhead for the "main" chip.

The LPC has hardware IIC and SPI so the transmission to the main can be done at anothet level than the bitbang.

Erik

List of 32 messages in thread
TopicAuthorDate
Interfacing 16550 to 80c51            01/01/70 00:00      
   use an SPI UART            01/01/70 00:00      
      Why not an 16550            01/01/70 00:00      
         parallel - serial vs serial -serial            01/01/70 00:00      
         I hope you have the datasheet            01/01/70 00:00      
            well, in this case            01/01/70 00:00      
               That's my point ...            01/01/70 00:00      
                  if he wants to make crap, help him make            01/01/70 00:00      
                     There's no accounting for taste.            01/01/70 00:00      
                        External uart            01/01/70 00:00      
                        a LPC            01/01/70 00:00      
                           Well, that's an option, BUT ...            01/01/70 00:00      
                              My opinion: (1) nor valid (FedEx) (2) un            01/01/70 00:00      
                                 this may be wandering off topic, but            01/01/70 00:00      
                                    many            01/01/70 00:00      
                                       Tested or "seemed to work" ?            01/01/70 00:00      
                                          "try it and ship it"            01/01/70 00:00      
                                             where you sit determines what you see            01/01/70 00:00      
                                                I think apples and oranges            01/01/70 00:00      
                                                   that's the source of the trouble ...            01/01/70 00:00      
   SPI or I2C to UART            01/01/70 00:00      
   Pins, Area, EMI            01/01/70 00:00      
      can't you just specify 2 stop bits?            01/01/70 00:00      
         no i cant            01/01/70 00:00      
            Some possibilities            01/01/70 00:00      
               80c51 Software UART            01/01/70 00:00      
            Why not?            01/01/70 00:00      
               is this not being one of the "folks" Quo            01/01/70 00:00      
   what device does not like 2 stop bits?            01/01/70 00:00      
      Just a guess ...            01/01/70 00:00      
   Schematic for 16550/8051            01/01/70 00:00      
      16550/8051 example            01/01/70 00:00      

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