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03/07/07 08:22
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 		 #134445 - is AT89C51 can support Auto Address Rec: feature ?
Hello to all well i am trying to design a system as discribed earlier that in that system there are many slaves, and a Master, so according to my previous post i have concluded that i cannot control the Slaves through PC's RS232 port so i am going to use an another 8051, (AT89C51 or AT89C2051) but i have found that in the DataSheet of the 8051 from Atmel the havent shown that their 8051 based MCU's had two Registers which are essential for Automatic Address Recoganization, that are SADDR and SADDEN , so could any one tell me that how to confirm that these MCUs have "Automatic Address Recoganization" feature,

well i have wrote the program for Slave in Assembly that is just same as the Intel's one but with slight chnging..

Save This Code
		ORG 0000H
		LJMP ON_RESET
		ORG 0023H
		LJMP SERIAL
		ORG 0030H
ON_RESET:	MOV SCON, #0F0H
		ORL PCON, #40H
		MOV TH1,#0F3H
		MOV TL1,#000H
		MOV TCON, #34H
INTERRUPTS: 	SETB EA 		; Enable global interrupt
		SETB ES 		; Enable serial port interrupt
ADDRESSES: 	MOV SADDR, # 11110001 	; Define Given & Broadcast
		MOV SADEN, # 11111010 	; Addresses
					; GIVEN 4 11110X0X
					; BROADCAST 4 11111X11
		SJMP $
SERIAL:		PUSH PSW
		CLR RI 			; RI set when address is
					; recognized & must be cleared
					; in software
		CLR SM2 		; Reconfigure slave to receive
					; data bytes
RECEIVE_DATA:	JNB RI, $ ; Wait for RI to be set
		MOV A, SBUF 		; Receive data byte & store
					; in temporary location
		CLR RI 			; Clear flag for next
					; reception
		SETB SM2 		; Re-enable Automatic
					; Addressing
		POP PSW
		RETI
		END


List of 59 messages in thread
TopicAuthorDate
is AT89C51 can support Auto Address Rec: feature ?            01/01/70 00:00      
   IF they aren't there, it doesn't do it!            01/01/70 00:00      
      why the automatic address recognition?            01/01/70 00:00      
         Every little helps!            01/01/70 00:00      
            let's calculate a bit            01/01/70 00:00      
               an often forgotten fact            01/01/70 00:00      
                  certainly            01/01/70 00:00      
                     let me try            01/01/70 00:00      
                        this sounds like....            01/01/70 00:00      
                           As I said, it is not easy to find an example thst            01/01/70 00:00      
                              if it\'s not easy to find an example...            01/01/70 00:00      
      WHO told you that you HAVE to use a derivative t            01/01/70 00:00      
         Well ofcourse i am not going to design 100000            01/01/70 00:00      
            I will help you, but not write your code            01/01/70 00:00      
               Well thanks Erik            01/01/70 00:00      
               well sir if i write a code then could you check it            01/01/70 00:00      
                  sure            01/01/70 00:00      
                     well sir its this ...            01/01/70 00:00      
                        you can't do this            01/01/70 00:00      
                           well instead of Rx            01/01/70 00:00      
                        On Comments            01/01/70 00:00      
                           So Sorry for my Mistake            01/01/70 00:00      
                              stop accusing yourself            01/01/70 00:00      
                                 Well sir its Honor for me :-)            01/01/70 00:00      
                           The Right one here goes            01/01/70 00:00      
                              I think you made the wrong change            01/01/70 00:00      
                              this will (almost) work if you only have one data            01/01/70 00:00      
                                 Well sir Eric i think you are Talking about it....            01/01/70 00:00      
                                    not yet            01/01/70 00:00      
                                    Ooooh, another '51 pitfall...            01/01/70 00:00      
                                       Hows That ?            01/01/70 00:00      
                                          still not good...            01/01/70 00:00      
                                    I just noticed            01/01/70 00:00      
                                       as I said            01/01/70 00:00      
                                          Ah i am not in Hurry....            01/01/70 00:00      
                                             still not good II.            01/01/70 00:00      
                                                I have did it... you can see it i have Edited it .            01/01/70 00:00      
                                             ok, look at line 4            01/01/70 00:00      
                                                Simple,like if Address not match then GO_ON            01/01/70 00:00      
                                                   WHAT is in 'b'?            01/01/70 00:00      
                                                      I have finally got it.....            01/01/70 00:00      
                                                         now add the PUSH/POP PSW...            01/01/70 00:00      
                                                            Well i think that Pushing PSW is not neccesary ..            01/01/70 00:00      
                                                               better this than be sorry....            01/01/70 00:00      
                                                               it is            01/01/70 00:00      
                                                                  Sir you are right that carry is effected...            01/01/70 00:00      
                                                                     avoid common pitfalls            01/01/70 00:00      
                                                                     famous last words            01/01/70 00:00      
                                                                        Well sir i will never forget the carry is changed.            01/01/70 00:00      
                                                                           RTFM            01/01/70 00:00      
                                                                        Well sir How to save the Carry ??            01/01/70 00:00      
                                                                           see http://www.8052.com/forum/read.phtml?id=134583            01/01/70 00:00      
                                                                              Well sir i will see this later...            01/01/70 00:00      
                                                                                 so, that is the reason for the hurry            01/01/70 00:00      
         No compulsion!            01/01/70 00:00      
   Oops its Erik not Eric (Proc: For Multiple Data)            01/01/70 00:00      
      stop hurrying            01/01/70 00:00      
   It just hit me - you can't            01/01/70 00:00      
   Well sir i have give up ... means no computer...            01/01/70 00:00      

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