What this mean in PIC

Discussion in 'Embedded Systems and Microcontrollers' started by RRITESH KAKKAR, Apr 22, 2015.

  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,831
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    Hi ,
    what this mean in PIC
    1. pic16f72 i/sp
    14031FV

    2. pic16f72 i/sp
    1343KAK

    1. pic16f72 i/sp
    1412KR2
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    If those are markings on the package, they are likely to be date codes which specify the year and the week of the year in which the part was produced. Were they causing you any particular anxiety?
     
  3. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,831
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    Actually i have 10-12 Pic16f72 with these code.
    There are not working as per codes some times free work after re-programming it get work, so i just look on them for knowing it in deep!
    Here is the code...
    with 6V powers supply, 20Mhz and 22pF Cap at osc.

    Code (C):
    1. #include <htc.h>
    2.  
    3. __CONFIG( BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
    4.  
    5. #define _XTAL_FREQ 20000000
    6.  
    7. main(){
    8.  
    9. TRISB=0x00;
    10. PORTB=0x00;
    11. __delay_ms(400);
    12.     while(1){
    13.         PORTB=0x00;
    14. __delay_ms(400);
    15.  
    16.         PORTB=0xff;
    17. __delay_ms(400);
    18.  
    19.  
    20.      
    21.  
    22.  
    23.  
    24.  
    25.  
    26. }
    27.  
    28.  
    29.  
    30.  
    31.  
    32.  
    33. }
    34.  
    35.  
     
    Last edited: Apr 22, 2015
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
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    I once went far looking use dedicated function practice fundamental after reprogramming and full refurbishment.
     
  5. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    If you bought them from a reputable distributor you can return them for a credit.
    I get the joke now -- PIC is a new form of English with syntax and semantics that have to be heard to be understood.
     
    Last edited: Apr 23, 2015
  6. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    When does it stop working? After you remove/apply power?
     
  7. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,831
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    Hello,
    The PIC are fine working in Programmer.
    In my circuit there is 4 PIC16f72, in of this 1st and 3rd are working.
    the 2nd and 4th is not working at all.
    I have checked connection all are fine but i don't understand, what is the hiding problem in it??
    I have added 7805 5V supply too.
     
  8. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,675
    899
    Ritesh,

    Please answer the questions put to you. Otherwise, this will end up another century post thread with no resolution.

    What does that mean? Are you doing in-circuit simulation or does it simply mean the chips were erased and programmed successfully according to the programmer? Did you read the chips to see if changes you intended were incorporated?

    What happens if you swap 1 with 2 and 3 with 4 in the circuit? Do chips #1 and 3 still work in their new positions?

    John
     
    Last edited: Apr 23, 2015
    mkbutan likes this.
  9. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,831
    89
    Hello,
    Yes, it is working programmer!
    Hello,
    chip are working in position 1 an 3 but 2 and 4 are not!!
    I test the chip in all position it only work in 1 and 3 only.
     
  10. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    The problem is either in your program (i.e., chips in positions 2 and 4 need to function differently than chips in positions 1 and 3) or in the wiring for positions 2 and 4. It is not a problem with your PIC chips.

    John
     
    RRITESH KAKKAR likes this.
  11. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,831
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    Hello
    You are right sir, The chip are with same code i have exchanged the pic to all postion the problem is same.
    What to do?
     
  12. Brevor

    Active Member

    Apr 9, 2011
    279
    54
    Post your schematic.
     
  13. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,831
    89
    OK, i will try in PCB not in zero PCB.
     
  14. John P

    AAC Fanatic!

    Oct 14, 2008
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