Enabling weak internal pull up resistors on port B

Closed Thread
Results 1 to 9 of 9

Hybrid View

  1. - 27th July 2010, 18:11 #1
    dbodenheimer's Avatar
    dbodenheimer
    dbodenheimer is offline Junior Member
    Join Date
    Jul 2010
    Posts
    10

    Did you find this post helpful? Yes | No

    Default

    Ok, So let's say for some reason the OPTION_REG is getting reset. What syntax do I use in PicBasic Pro to set it again?
  2. - 27th July 2010, 21:00 #2
    LinkMTech's Avatar
    LinkMTech
    LinkMTech is offline Member
    Join Date
    Nov 2007
    Location
    West Covina, CA
    Posts
    219

    Did you find this post helpful? Yes | No

    Default

    Quote Originally Posted by dbodenheimer View Post
    ok, so let's say for some reason the option_reg is getting reset. What syntax do i use in picbasic pro to set it again?
    option_reg.7=0
    Louie
  3. - 28th July 2010, 14:30 #3
    malc-c's Avatar
    malc-c Guest

    Did you find this post helpful? Yes | No

    Default

    I've often found internal pull-ups troublesome and simply use small external resistors between 4.7K and 10K depending on the input device
  4. - 7th October 2010, 20:23 #4
    Plcguy's Avatar
    Plcguy
    Plcguy is offline Junior Member
    Join Date
    Oct 2010
    Posts
    27

    Did you find this post helpful? Yes | No

    Default

    In that thought process, it appears option_reg.7 = 0 sets all 4 port B pull ups on an 16F88. Can one of those pins then be used as a serial output? I don't see where you can set individual pins.......
  5. - 8th October 2010, 15:55 #5
    HankMcSpank's Avatar
    HankMcSpank
    HankMcSpank is offline Senior Member
    Join Date
    Mar 2009
    Posts
    653

    Did you find this post helpful? Yes | No

    Default

    Quote Originally Posted by Plcguy View Post
    In that thought process, it appears option_reg.7 = 0 sets all 4 port B pull ups on an 16F88. Can one of those pins then be used as a serial output? I don't see where you can set individual pins.......
    On a 16f690, I do this to get the weak pullups working...

    Code:
    option_reg.7=0 ' Enable WPUs by individual pin 
WPUB = %11110000  'enable weak pullups on RB7, RB6, RB5 & RB4
    It all works weally weakpullup-tastically (but disable any other PIC stuff that maybe sharing those ports...and make sure they're all set as inputs)
    Last edited by HankMcSpank; - 8th October 2010 at 16:06.
« Previous Thread | Next Thread »

Members who have read this thread : 1

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

Bookmarks

Posting Permissions

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

Forum Rules