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luigi2
Visitor II
June 1, 2005
Question

PortB problem

  • June 1, 2005
  • 2 replies
  • 519 views
Posted on June 01, 2005 at 12:59

PortB problem

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    2 replies

    L
    luigi2Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:07

    Hello!

    what is the difference whit the I/O port of MCU P1,P3,P4 and the I/O port OF PSD PortA, PortB,PortC, PortD

    J
    jdaniel
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:07

    There are pretty significant differences. The MCU ports (P1, P3, and P4) basically have the same electrical characteristics as the Intel 8032AH MCU. This means that they're TTL-compatible and not CMOS technology. The PSD ports ARE CMOS ports which means that have much higher Voh and lower Vol. Additionally, they're capable of sinking / sourcing far more current than the MCU ports. Finally, the PSD ports can interact with the programmable logic to automatically serve different functions (chip selects, etc.).

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