Code doesn't work on 16F648A

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  1. #1
    Mr_Joe's Avatar
    Mr_Joe Guest

    Unhappy Code doesn't work on 16F648A


    I've written code for 16F628 (working well), i've added some new lines to this code but code size is up to 2K. And i changed PIC 16F648A code space of 4K. You know this PIC's has identical hardware. I changed configuration for 16F648A but code doesnt work. After that i wrote original code (cof. lines for 16F628) to the 16F648A, only chosing 16F648A on programmer. I'm suprising it's working. I changed only conf. lines for 16F648A on original code and wrote to PIC it doesn't work.

    Conf. lines on original code:
    @ DEVICE pic16F628A
    @ DEVICE pic16F628A, WDT_ON
    @ DEVICE pic16F628A, PWRT_ON
    @ DEVICE pic16F628A, PROTECT_OFF
    @ DEVICE pic16F628A, MCLR_OFF

    Conf. lines for 16F648A:
    @ DEVICE pic16F648A
    @ DEVICE pic16F648A, WDT_ON
    @ DEVICE pic16F648A, PWRT_ON
    @ DEVICE pic16F648A, PROTECT_OFF
    @ DEVICE pic16F648A, MCLR_OFF

    What do you think, why it doesn't working?

  2. #2
    Join Date
    Jul 2003


    PBP prior to V2.45 had a RAM Bank switching bug for this PIC. Always check with MeLabs website upgrade page for version fix issues.

  3. #3
    Mr_Joe's Avatar
    Mr_Joe Guest


    Thanks, it's ok now.

  4. #4
    Join Date
    Mar 2008

    Default Re: Code doesn't work on 16F648A

    I am having problems using an external oscillator on a 16f648a. I can use the internal oscillator with no problem however when I try to use an external ceramic oscillator the code does not run. On the config below if I change the second line to” cfg = _XT_OSC” I have no signs of function. I am sure it is something very simple I just cannot see the problem.

    cfg&= _WDT_OFF
    cfg&= _PWRTE_OFF
    cfg&= _MCLRE_OFF
    cfg&= _BODEN_OFF
    cfg&= _LVP_OFF
    cfg&= DATA_CP_OFF
    cfg&= _CP_OFF
    __CONFIG cfg

  5. #5
    Join Date
    Mar 2008

    Default Re: Code doesn't work on 16F648A

    Sorry I got it because it was a 10mhz oscillator I needed to use "cfg = _HS_OSC" I found the answer in this pdf.

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