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Do you have a question on Embedded electronics and controls? Ask our Expert, Paul Clarke

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Paul Clarke

Paul has 20+ years of working as a digital electronics engineer and has strong software skills in assembly and C for embedded systems. Currently developing embedded electronics for thermal management control solutions for the air movement industry (HVAC & RAC).




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  • hi sir

    im doing my B.E final year . we are decide to do project "extend the microcontroller I/O pins using 8bit shift register with parallel inputs and 8bit shift register with parallel outputs" whether it slow down the process in taking inputs and giving outputs for operations? or sugest me any other options to increase I/O pins in low cost?

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  • hi sir

    im doing my B.E final year . we are decide to do project "extend the microcontroller I/O pins using 8bit shift register with parallel inputs and 8bit shift register with parallel outputs" whether it slow down the process in taking inputs and giving outputs for operations? or sugest me any other options to increase I/O pins in low cost?

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  • in reply to e14 Contributor
    In short, yes it is slower than using I/O on the side of the chip, that will be the same whatever you do. Question is how fast do you want to sample them at? What speed will you have  to clock the data in and out and then how fast will the micro have to run to cope?
     
    As for cost – I would have guessed that a I/O expansion IC like the Microchip MCP230008 or alike would be cheaper than, and better than using shift registers.