Charles Oram wrote:

>Hi,
>Has anyone out there had problems migrating form the PIC16F877 to the
>PIC16F877A, particularly in the areas of the oscillator and MCLR pin? I've
>noticed from the datasheets, migration document and searching on the 'net
>that these could be problem areas. The circuit I have pulls MCLR up with a
>100k resistor (most seem to use a 10k).
>I don't know if I will have a problem and I know that the real answer is 
>"try
>it and see", but I have a customer who needs to build 80 units and can't get
>'877s, so they want to build them with the '877A and have me fix the
>software to work later.
>
>regards,
>Charles
>
>_________________________________________________________________
>Check out the latest video  @  http://xtra.co.nz/streaming
>
>  
>
Physically...never had a problem.   Check for differences in the 
configuration though.  Here is part of my standard header:
 (watch out for line wrap)
#ifdef    PROD
 #ifdef    ICE2000
    #include <p16f877.inc>        ; processor specific variable definitions
    __CONFIG _CP_OFF & _WDT_ON & _BODEN_ON & _PWRTE_ON & _HS_OSC & 
_WRT_ENABLE_OFF & _LVP_OFF & _DEBUG_OFF & _CPD_OFF
 #endif
 #ifndef    ICE2000   
    #include    <p16f877A.inc>    ; processor specific variable definitions
    __CONFIG _CP_ALL & _WDT_ON & _BODEN_ON & _PWRTE_ON & _HS_OSC & 
_WRT_OFF & _LVP_OFF & _CPD_OFF
 
 #endif
#endif

Bill
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