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???
04/14/07 15:16
Modified:
  04/14/07 16:09
Read: times


 		 #137259 - if it\'s almost correct, it\'s still wrong :-)
Responding to: ???'s previous message
Mike Stegmaier said:

For example, this code:

---- your mainline code here
AJMP $

routine1:
---- your routine1 code here
RET

routine2:
---- your routine2 code here
RET

AJMP $
END


is better than this code:

---- your mainline code here

routine1:
---- your routine1 code here
RET

routine2:
---- your routine2 code here
RET

END

Because the second code will run the 1st routine after the mainline ends whether or not the routine has been called. Also because of RET, it will run code at address R6:R7 (or is it R7:R6?) immediately after RET is executed, provided register bank 0 is used (which is the default setting), and SP remains at 07h.



NO, not quite...

Save This Code
---- your mainline code here
AJMP $

routine1:
---- your routine1 code here
RET

routine2:
---- your routine2 code here
RET

END


is correct.

and

Save This Code
routine1:
---- your routine1 code here
RET

routine2:
---- your routine2 code here
RET

---- your mainline code here
AJMP $
END


is also correct. Both assuming that your reset vector points to the beginning of your mainline code.


there is no reason to add a redundant JMP..


You also stated
"it will run code at address R6:R7 (or is it R7:R6?) immediately after RET is executed, "

I thought that the stack was used to keep return adresses and the stack pointer will point to the locations containing the return address.



regards

Patrick

List of 34 messages in thread
TopicAuthorDate
RxD to LCD problems            01/01/70 00:00      
   Serial ISR            01/01/70 00:00      
   work needed.            01/01/70 00:00      
   you need to control flow            01/01/70 00:00      
      confused            01/01/70 00:00      
         this is what I mean            01/01/70 00:00      
            OK            01/01/70 00:00      
               yes            01/01/70 00:00      
            Non-useful Serial ISR            01/01/70 00:00      
               AND it's stuck            01/01/70 00:00      
                  thanks            01/01/70 00:00      
               I was going for optimization.            01/01/70 00:00      
      It's functioning            01/01/70 00:00      
         now stay consistent            01/01/70 00:00      
            Terminating code?            01/01/70 00:00      
               .            01/01/70 00:00      
                  correct terminology            01/01/70 00:00      
                  Missing the point            01/01/70 00:00      
                     i get it now            01/01/70 00:00      
                        Most, but not all            01/01/70 00:00      
                        why on earth            01/01/70 00:00      
                        if it\'s almost correct, it\'s still wrong :-)            01/01/70 00:00      
                           ok            01/01/70 00:00      
                              Not R6 and R7            01/01/70 00:00      
                                 well it happend again            01/01/70 00:00      
                                    Q.E.D.            01/01/70 00:00      
                                       One further comment is needed            01/01/70 00:00      
                              Hey            01/01/70 00:00      
                        Dangerous recommendation            01/01/70 00:00      
                           good point            01/01/70 00:00      
                              they all do            01/01/70 00:00      
                  it 'trust' the same as 'experiment'?            01/01/70 00:00      
   more issues            01/01/70 00:00      
      Joe, please read this            01/01/70 00:00      

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