18F877A to 18F876A


Closed Thread
Results 1 to 5 of 5

Hybrid View

  1. #1
    Join Date
    Sep 2004
    Location
    Mentor, Ohio
    Posts
    352


    Did you find this post helpful? Yes | No

    Smile

    Hello Tobias,

    Did you take the time to look at the datasheets on each of the uP's to see what the differences are in the settings.

    You do realize the pinouts are different between the two. If you only took power from the X1 and connected it to the 28 pin then what have you done with MCLR? It needs to be tied to Vdd in order for the chip to work properly. As I glanced over the datasheet (it's the same for both) I didn't see any differences in the registers with a quick scan but I could be wrong. Also the "A" version chips need a .1uF bypass capacitor as close as possible to the power pins. What are you using for an oscillator, internal or external, and if external how do you have it connected to the adaptor?

    HTH,

    BobK
    Last edited by BobK; - 9th November 2007 at 18:48. Reason: After thoughts

  2. #2


    Did you find this post helpful? Yes | No

    Default

    Bob I figured it out. Internal OSC!!! Does my ADCON etc look correct for configuring the ports? I am going to go with a 16F866 with the internal OSC. Whats the benefit of an external OSC?
    Last edited by Tobias; - 9th November 2007 at 18:47.

Similar Threads

  1. 18f877a??????
    By comwarrior in forum General
    Replies: 3
    Last Post: - 27th September 2009, 20:40
  2. problem RB4-7 on a 18F876A
    By mischl in forum mel PIC BASIC Pro
    Replies: 8
    Last Post: - 30th March 2006, 14:30

Members who have read this thread : 0

You do not have permission to view the list of names.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts