Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
12/31/04 16:55
Read: times


 
#84176 - Problem displaying posts?
Responding to: ???'s previous message
I mentioned the oversampling as a means of detecting the edge of the startbit in my first posting to this thread, mentioning there also the possibility to use timer2 interrupt for the same purpose; and was discussing both ideas further in the subsequent posts. Maybe the postings don't display to you and Andy completely? I use the "flat" mode and I see all my text, but as I understood you are using the traditional "threaded" mode - maybe there is some problem with it?

If you set
mov   t2con,#6
mov   th2,#0FFh
mov   tl2,#0FFh
setb  et2
setb  ea 

the first 1->0 transition on P1.0 pin will increment the timer value, causing overflow to 0000h hence firing the interrupt. To "reenable" the edge detection, th2:tl2 has to be reset to 0FFFFh.

Jan Waclawek


List of 27 messages in thread
TopicAuthorDate
Polling/Interrupt For Serial Input            01/01/70 00:00      
   bible time            01/01/70 00:00      
   Soft UART            01/01/70 00:00      
   Hardware?            01/01/70 00:00      
      SW UART is not a taboo!            01/01/70 00:00      
         yes...            01/01/70 00:00      
         think before you do            01/01/70 00:00      
   Use oversampling            01/01/70 00:00      
      soft UART            01/01/70 00:00      
      Half bits            01/01/70 00:00      
      Oversampling            01/01/70 00:00      
         It's not so bad            01/01/70 00:00      
            Oh yes it is!            01/01/70 00:00      
               Haven't read it completely?             01/01/70 00:00      
                  neither have I            01/01/70 00:00      
                     Sure you did not!            01/01/70 00:00      
                        did I miss it            01/01/70 00:00      
                           Problem displaying posts?            01/01/70 00:00      
                              sure that will work            01/01/70 00:00      
                                 NOT A PIC            01/01/70 00:00      
   Just forget 89c51 then.            01/01/70 00:00      
   @Erik            01/01/70 00:00      
      ...all said already.            01/01/70 00:00      
      OS? Threads?!            01/01/70 00:00      
      Appnote to read            01/01/70 00:00      
      threads            01/01/70 00:00      
         Problem Solved            01/01/70 00:00      

Back to Subject List