Help for 89c2051 circuit assembly

Discussion in 'Embedded Systems and Microcontrollers' started by Parv Bhavsar, May 14, 2016.

  1. Parv Bhavsar

    Thread Starter New Member

    Apr 12, 2016
    15
    0
    Hello,
    I am working on my circuit in which I am using a 89c2051 controller.
    On PCB I have connected following pins to controller
    1)Vcc
    2)Xtal1 & xtal2 to oscillator and capacitors
    3) GND
    4) All those 4 port pin that I am using to trigger transistors
    Now my question is do I need to do something to RST or any other pin,
    Or just live them open circuited...?
    Thank You in advance.
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,377
    494
    Datasheet should contain the basic circuit that is needed to operate the uC. Just copy it.
     
  3. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,377
    494
    "Reset input. All I/O pins are reset to 1s as soon
    as RST goes high. Holding the RST pin high for
    two machine cycles while the oscilla
    tor is running resets the device.
    Each machine cycle takes 12 oscillator or clock cycles."


    Since you don't know where your Reset is floating (high or low), you want to give it a defined value. Since you don't want the device constantly reset, you want it connected to ground.
     
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