sync or async ?

Discussion in 'Homework Help' started by Anthony Quah, Mar 7, 2008.

  1. Anthony Quah

    Thread Starter Active Member

    Dec 1, 2007
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    0
    Guys,

    need some advice to confirm if below statement require to write sync or async assembly language program...For you information, i am doing a multifunction calculator...using M68HC11 microcontroller with assembly language to interface...

    "This value must then be continuously transmitted serially and it should be able to be viewed on the
    calculators display at the user’s discretion. The calculator’s serial communication’s will operate at
    9600 BAUD with 8 data bits 1 start bit, 1 stop bit and no parity."

    Thanks,
    ANthony
     
  2. rwmoekoe

    Active Member

    Mar 1, 2007
    172
    0
    that's async for sure.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    I concur that asynchronous mode is the mode you will need to use.

    hgmjr
     
  4. Anthony Quah

    Thread Starter Active Member

    Dec 1, 2007
    80
    0
    I also suspect it was a asynchronous...i just go thru

    Microcontroller Technology ( 68HC11 and 68HC12 ) by Peter Spasov Fifth Edition
    Chapter 8 - did say about it..

    - cause u need a low signal to send to Rx ( Receiver ) to tell it , u going to trasmit data...

    Thanks guy..for the help
     
  5. AlexR

    Well-Known Member

    Jan 16, 2008
    735
    54
    If the protocol has start and stop bits then by definition it must be async.
     
  6. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,790
    I do not think that the 68HC11 is capable of syncronous serial communication in the sense of Bisync, SDLC, or HDLC. The SCI peripheral is async ONLY and the SPI peripheral is only syncronous within a character.
     
  7. Anthony Quah

    Thread Starter Active Member

    Dec 1, 2007
    80
    0
    Thank for the extra information... ^^
     
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