SPI slave without MISO pin

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I'm designing a circuit with this LCD display.
It will interface with STM32L0 MCU over SPI bus.
as you can see, in LCD's datasheet there are only 3 lines of SPI pins. SCL - Clock, SI - Serial Data and CS.



I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data? Is it possible to use SPI bus like that with route only 3 pins?



thank you!






pcb-design circuit-design spi lcd







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    up vote
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    favorite












    I'm designing a circuit with this LCD display.
    It will interface with STM32L0 MCU over SPI bus.
    as you can see, in LCD's datasheet there are only 3 lines of SPI pins. SCL - Clock, SI - Serial Data and CS.



    I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data? Is it possible to use SPI bus like that with route only 3 pins?



    thank you!






    pcb-design circuit-design spi lcd







    share|improve this question























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I'm designing a circuit with this LCD display.
      It will interface with STM32L0 MCU over SPI bus.
      as you can see, in LCD's datasheet there are only 3 lines of SPI pins. SCL - Clock, SI - Serial Data and CS.



      I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data? Is it possible to use SPI bus like that with route only 3 pins?



      thank you!






      pcb-design circuit-design spi lcd







      share|improve this question













      I'm designing a circuit with this LCD display.
      It will interface with STM32L0 MCU over SPI bus.
      as you can see, in LCD's datasheet there are only 3 lines of SPI pins. SCL - Clock, SI - Serial Data and CS.



      I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data? Is it possible to use SPI bus like that with route only 3 pins?



      thank you!






      pcb-design circuit-design spi lcd




      pcb-design circuit-design spi lcd






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 4 hours ago









      Mercury Avangburg

      385




      385




















          2 Answers
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          Is it possible to use SPI bus like that with route only 3 pins?




          For sure. Many devices need only data from the master and do what they have to do without conferring with the master. I can think of DAC devices that produce an analogue output with just the data collected from the SPI bus. Some will communicate back to the master but only usually when setting up the registers of more complex devices; for a simple DAC, MISO is usually omitted: -



          enter image description here



          Digipots have a similar story; they mostly don't have MISO: -



          enter image description here






          share|improve this answer





























            up vote
            1
            down vote














            I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data?




            That is very well possible.




            Is it possible to use SPI bus like that with route only 3 pins?




            Yes, but floating pins are bad so add a pull-up to your MISO.






            share|improve this answer




















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              2 Answers
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              2 Answers
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              up vote
              2
              down vote



              accepted











              Is it possible to use SPI bus like that with route only 3 pins?




              For sure. Many devices need only data from the master and do what they have to do without conferring with the master. I can think of DAC devices that produce an analogue output with just the data collected from the SPI bus. Some will communicate back to the master but only usually when setting up the registers of more complex devices; for a simple DAC, MISO is usually omitted: -



              enter image description here



              Digipots have a similar story; they mostly don't have MISO: -



              enter image description here






              share|improve this answer


























                up vote
                2
                down vote



                accepted











                Is it possible to use SPI bus like that with route only 3 pins?




                For sure. Many devices need only data from the master and do what they have to do without conferring with the master. I can think of DAC devices that produce an analogue output with just the data collected from the SPI bus. Some will communicate back to the master but only usually when setting up the registers of more complex devices; for a simple DAC, MISO is usually omitted: -



                enter image description here



                Digipots have a similar story; they mostly don't have MISO: -



                enter image description here






                share|improve this answer
























                  up vote
                  2
                  down vote



                  accepted







                  up vote
                  2
                  down vote



                  accepted







                  Is it possible to use SPI bus like that with route only 3 pins?




                  For sure. Many devices need only data from the master and do what they have to do without conferring with the master. I can think of DAC devices that produce an analogue output with just the data collected from the SPI bus. Some will communicate back to the master but only usually when setting up the registers of more complex devices; for a simple DAC, MISO is usually omitted: -



                  enter image description here



                  Digipots have a similar story; they mostly don't have MISO: -



                  enter image description here






                  share|improve this answer















                  Is it possible to use SPI bus like that with route only 3 pins?




                  For sure. Many devices need only data from the master and do what they have to do without conferring with the master. I can think of DAC devices that produce an analogue output with just the data collected from the SPI bus. Some will communicate back to the master but only usually when setting up the registers of more complex devices; for a simple DAC, MISO is usually omitted: -



                  enter image description here



                  Digipots have a similar story; they mostly don't have MISO: -



                  enter image description here







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited 4 hours ago

























                  answered 4 hours ago









                  Andy aka

                  232k10172395




                  232k10172395






















                      up vote
                      1
                      down vote














                      I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data?




                      That is very well possible.




                      Is it possible to use SPI bus like that with route only 3 pins?




                      Yes, but floating pins are bad so add a pull-up to your MISO.






                      share|improve this answer
























                        up vote
                        1
                        down vote














                        I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data?




                        That is very well possible.




                        Is it possible to use SPI bus like that with route only 3 pins?




                        Yes, but floating pins are bad so add a pull-up to your MISO.






                        share|improve this answer






















                          up vote
                          1
                          down vote










                          up vote
                          1
                          down vote










                          I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data?




                          That is very well possible.




                          Is it possible to use SPI bus like that with route only 3 pins?




                          Yes, but floating pins are bad so add a pull-up to your MISO.






                          share|improve this answer













                          I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data?




                          That is very well possible.




                          Is it possible to use SPI bus like that with route only 3 pins?




                          Yes, but floating pins are bad so add a pull-up to your MISO.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 4 hours ago









                          Oldfart

                          7,0832723




                          7,0832723



























                               

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