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How many Serial In and Outs can you have on one Chip ? — Parallax Forums

How many Serial In and Outs can you have on one Chip ?

ArchiverArchiver Posts: 46,084
edited 2004-06-15 16:40 in General Discussion
Hello

New to basic Stamp

How many serial In's and Out's can you use on the same chip ?

I would like to run a touch screen and another serial device from
once stamp

Is this posible ?


If you have and answer please emial me at

mark30504@y...

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2004-06-15 15:32
    At 11:31 AM 6/15/04 +0000, Mark wrote:
    >Hello
    >
    >New to basic Stamp
    >
    >How many serial In's and Out's can you use on the same chip ?

    A maximum of 17 using all 16 I/O ports plus the debug port.


    >I would like to run a touch screen and another serial device from
    >once stamp
    >
    >Is this posible ?

    In general, yes, but it more depends on the timing requirement of these devices.
    Only one I/O port can be active during any one instruction cycle. There is no overlapping of I/O. That may or may not matter depending on your specific devices.



    >If you have and answer please emial me at
    >
    >mark30504@y...
    Answers are posted to this forum so that all can benefit from the questions and answers.

    Regards,

    Bruce Bates
  • ArchiverArchiver Posts: 46,084
    edited 2004-06-15 15:38
    The BS2 can run an In or an Out on each of its
    16 I/O pins, plus one additional one on its
    programming port.

    You MUST be notified, however, that the BS2 is
    a single tasking beast. Thus, when it is
    talking on one pin, it can't simultaneously
    recieve on another pin.

    You CAN put in place some sampling, or time-out,
    to 'pay-attention' to several ports in a round-robin
    fashion, though.

    --- In basicstamps@yahoogroups.com, "Mark" <mark30504@y...> wrote:
    > Hello
    >
    > New to basic Stamp
    >
    > How many serial In's and Out's can you use on the same chip ?
    >
    > I would like to run a touch screen and another serial device from
    > once stamp
    >
    > Is this posible ?
    >
    >
    > If you have and answer please emial me at
    >
    > mark30504@y...
  • ArchiverArchiver Posts: 46,084
    edited 2004-06-15 15:48
    Yes, no problem. The serial connections are not buffered, so you may
    need to implement flow-control with some devices. Any pin can be a
    serial connection.

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office

    Original Message
    From: Mark [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=baQTAgt2eE00k0_-6woBHgdY4ksEFyY160zATuKjwtg444vR0rSzMxwWkjRO43v05QtnlBB2oqhgmvg]mark30504@y...[/url
    Sent: Tuesday, June 15, 2004 6:31 AM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] How many Serial In and Outs can you have on one
    Chip ?


    Hello

    New to basic Stamp

    How many serial In's and Out's can you use on the same chip ?

    I would like to run a touch screen and another serial device from
    once stamp

    Is this posible ?


    If you have and answer please emial me at

    mark30504@y...
  • ArchiverArchiver Posts: 46,084
    edited 2004-06-15 16:11
    --- In basicstamps@yahoogroups.com, "Mark" <mark30504@y...> wrote:
    > Hello
    >
    > New to basic Stamp
    >
    > How many serial In's and Out's can you use on the same chip ?
    >
    > I would like to run a touch screen and another serial device from
    > once stamp
    >
    > Is this posible ?
    >
    >
    > If you have and answer please emial me at
    >
    > mark30504@y...

    Hi Mark,

    The BS2 is a 24 pin device and offers 16 pins for user interface as
    regards control.

    That is the limit for the product called a "BasicStamp 2" or BS2
    There is a 40 pin big-brother and a BS1 with less.

    That said, you can use serial devices to expand that dramatically.

    A single chip to drive LED's, this is a Maxim part, can drive 64
    individual relays.

    The a 74hc165 can be used and expands the input by unts of 8. That
    is to say, by connecting one 74HC165, you can use 4 pins and get 8
    inputs. add a second, you still use the 4 pins but get another 8.
    you can easily string 4 of these for 32 inputs on those 4 pins.

    there is a output part, the 74HC595 that will do that on outputs. so
    by using those same 4 pins, you can add groups of 8 ouputs.

    To be technically correct, the answer is 16
    but functionally, those can be expanded pretty far and wide.

    Dave
  • ArchiverArchiver Posts: 46,084
    edited 2004-06-15 16:32
    --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...> wrote:
    > At 11:31 AM 6/15/04 +0000, Mark wrote:
    > >Hello
    > >
    > >New to basic Stamp
    > >
    > >How many serial In's and Out's can you use on the same chip ?
    >
    > A maximum of 17 using all 16 I/O ports plus the debug port.


    well, you can use the serial ports connected to a PC, no ?
  • ArchiverArchiver Posts: 46,084
    edited 2004-06-15 16:40
    Yes, you can use the serial port connected to
    the PC -- it is also known as the 'debug port'.

    Note everything the PC sends on this port is
    echo'ed back to the PC -- if that matters to you.

    --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
    wrote:
    > --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...>
    wrote:
    > > At 11:31 AM 6/15/04 +0000, Mark wrote:
    > > >Hello
    > > >
    > > >New to basic Stamp
    > > >
    > > >How many serial In's and Out's can you use on the same chip ?
    > >
    > > A maximum of 17 using all 16 I/O ports plus the debug port.
    >
    >
    > well, you can use the serial ports connected to a PC, no ?
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