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???
12/04/06 23:12
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 		 #128938 - Not Mode 1!
Responding to: ???'s previous message
Roque Obusan said:
I am using UART Mode 1 ... Is there something I am missing here?

Absolutely - Multiprocessor works in Modes 2 & 3 only!

The so-called "bible" for the 8051; Chapter 3, p9, said:
Modes 2 and 3 have a special provision for multiprocessor communications. In these modes, 9 data bits are received. The 9th one goes into RB8. Then comes a stop bit. The port can be programmed such that when the stop bit is received, the serial port interrupt will be activated only if RB8 = 1.
This feature is enabled by setting bit SM2 in SCON.

80C51 Family Hardware Description:
http://www.nxp.com/acrobat_d...WARE_1.pdf



List of 27 messages in thread
TopicAuthorDate
Multiprocessor Communication SADDR & SADEN            01/01/70 00:00      
   I think you need to use 9bit mode            01/01/70 00:00      
   Not Mode 1!            01/01/70 00:00      
      ohhhhh            01/01/70 00:00      
         For reference            01/01/70 00:00      
         the better datasheets ...            01/01/70 00:00      
            Not in the so-called bible            01/01/70 00:00      
               that is correct, however            01/01/70 00:00      
      SM2 Bit            01/01/70 00:00      
         I remember it this way: "when SM2 is set I only ge            01/01/70 00:00      
      sortof an unrelated question            01/01/70 00:00      
         sort of short answer :)            01/01/70 00:00      
   still having trouble...            01/01/70 00:00      
      SADEN and SADDR is a bitch to explain            01/01/70 00:00      
         i thought SM2 sets address recognition...            01/01/70 00:00      
            it does - and it does not            01/01/70 00:00      
   automatic            01/01/70 00:00      
      comments            01/01/70 00:00      
   use SFR            01/01/70 00:00      
      I thought that but            01/01/70 00:00      
         my compiler....ummm...uuhhhh            01/01/70 00:00      
            Use an existing wickenhaeuser sfr definitio            01/01/70 00:00      
               hmmm            01/01/70 00:00      
                  NOOOOOOOOOOOOOOOOOOOO            01/01/70 00:00      
                     ok bare with me...            01/01/70 00:00      
                        almost            01/01/70 00:00      
                           Thanks!            01/01/70 00:00      

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