8051 ALE in dev board

Discussion in 'Embedded Systems and Microcontrollers' started by Tera-Scale, Sep 13, 2011.

  1. Tera-Scale

    Thread Starter Active Member

    Jan 1, 2011
    164
    5
    Hi,
    I am trying understanding why on my development board CP-JR51AC2 V2, I can't find the ALE pin . I am trying to build the circuit attached. On Proteus it worked perfectly while on my breadboard I have noting. I figured that the inputs from P0.2 - P0.7 on the 74HC373 had no function at all in the simulation as without them every thing worked smoothly. Is this the same in reality, as in the schematic the same outputs of the other 6 flip flops are floating. thanks
     
  2. stahta01

    Member

    Jun 9, 2011
    133
    21
  3. stahta01

    Member

    Jun 9, 2011
    133
    21
    In reality, letting inputs float can cause problems, I suggest connecting unused inputs to 74HC373 as high or low, not floating.

    Tim S.
     
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