16F877a, stopped working


Closed Thread
Results 1 to 3 of 3
  1. #1

    Default 16F877a, stopped working

    ok, i had my pic sat on my bench turned on and i went to make a brew and have a fag...
    I came back to find my LCD display off...
    i grabbed my power module to hold it down while i pulled the power jumper to turn of the power and realised my 5 volt regulator was increadably hot... so i pulled the jumper...

    Somehow while i was making a brew, the power wire from one side of the PIC to the other had come loose and was shorting...

    So, i put the wire back in and reconnected the power module... The LCD display initialised but did not display my "initialising" and "initialised" messages...
    I double checked everything, stuck it back in the programmer and re-programmed it, verifies ok... Still nothing...
    I stuck my multimeter around known output pins thinking perhaps my LCD had died... the data lines to the LCD were solid high...
    I tested the xtal lines thinking i had an xtal problem again... OSC1 read zero volts and OSC2 read 5 volts...

    I tested in my little Knight rider board and it reads the same...

    Have i killed it?

  2. #2
    Join Date
    Nov 2003
    Location
    Wellton, U.S.A.
    Posts
    5,924


    Did you find this post helpful? Yes | No

    Default

    Have i killed it?
    If it makes you feel any better... It was a quick death.
    Dave
    Always wear safety glasses while programming.

  3. #3


    Did you find this post helpful? Yes | No

    Default

    i'm just wondering (hoping, praying... last ditch...)

    I was thinking perhaps it might just be the XTAL circuit on the chip...

    Whats the formula to calculate frequency for RC osc?
    I'm trying to find it... can't see it though...

Similar Threads

  1. 16F877A with 20MHz XTAL not working?
    By ustredna in forum mel PIC BASIC Pro
    Replies: 12
    Last Post: - 19th August 2011, 15:04
  2. Blink.Bas on 18f45k20 Newbie seeks working example.
    By DiscoEd in forum mel PIC BASIC Pro
    Replies: 3
    Last Post: - 29th December 2009, 03:36
  3. First time with external oscillator - 16F877a Not working
    By financecatalyst in forum mel PIC BASIC Pro
    Replies: 8
    Last Post: - 15th October 2009, 17:14
  4. 16F877 vs. 16F877A
    By DavyJones in forum General
    Replies: 12
    Last Post: - 11th April 2009, 18:22
  5. Clock connection to DS1802 from 16F877A
    By coyotegd in forum mel PIC BASIC Pro
    Replies: 7
    Last Post: - 3rd January 2006, 18:52

Members who have read this thread : 1

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