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Homework Help: PIC microcontroller, rs232

  1. Dec 12, 2009 #1
    1. The problem statement, all variables and given/known data

    1. SPI
    2. i2c
    3. RS232
    4. RS485

    Match The following interfaces to their category
    a. Asynchronous Serial, point-to-point
    b. Synchronous Serial with CS line
    c. Asynchronous data bus
    d. synchronous with address on the same line as data

    2. Relevant equations

    3. The attempt at a solution

    My guess so far would be 2-b, 1-c , 4-d, and 3- a... is this true?
  2. jcsd
  3. Dec 14, 2009 #2


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    Science Advisor

    These are incorrect. Review the definitions of synchronous and asynchronous data transfer, http://en.wikipedia.org/wiki/Comparison_of_synchronous_and_asynchronous_signalling, and then look up the protocols and try to match the protocol with the characteristics.

    http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus" [Broken]
    http://en.wikipedia.org/wiki/I2c" [Broken]
    http://en.wikipedia.org/wiki/EIA-485" [Broken]
    http://en.wikipedia.org/wiki/RS-232" [Broken]

    HINT: See which signals are used for communications! Is there a clock line, of some sort? For RS-232, consider whether or not you can daisy chain several serial devices.
    Last edited by a moderator: May 4, 2017
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