Don't forget stack depth only 2 calls !
regards,
Graham Daniel.

James Cameron wrote:
>
> I prototype on 16F84 and move the final to OTP 12C509A's.
>
> I've been building a checklist for moving code from PIC 16F84 to PIC
> 12C509A and would appreciate other's comments.  What have I missed from
> the list?  Some of them are obvious; don't use 16F84 features.  But it's
> the strange ones that are likely to be missed.
>
> I would expect most processor specific code would be placed in IFDEF
> sections,
> testing for the processor symbols __12C509A or __16F84.
>
> The checklist;
>
> - include P12C509A.INC instead of P16F84.INC,
> - check __CONFIG flags,
>         - use of MCLRE,
>         - no use of PWRTE,
>         - valid oscillator configuration,
> - check code for no use of instructions SUBLW, ADDLW, nor RETFIE,
> - check code for no use of register addresses PORTA, PORTB, EEDATA,
> EEADR, PCLATH, INTCON, EECON1, nor EECON2,
> - check code for no use of STATUS bits IRP, RP1, nor RP0,
> - check code for OPTION register,
>         - no use of OPTION_REG,
>         - use of OPTION instruction,
>         - no use of OPTION_REG bits RBPU nor INTEDG,
> - check register file addresses used do not exceed limits (valid range
> is 0x07 to 0x1f and 0x30 to 0x3f, addresses below 0x0c are in use on
> 16F84 anyway, so this is the first common free address),
> - check code for TRIS register,
>         - no use of TRISA nor TRISB,
>         - use of TRIS,
> - if using _IntRC_OSC,
>         - clock may drift, check any external timing assumptions,
>         - check first instruction is MOVWF OSCCAL,
>         - check 0x3ff is not to be programmed (contains MOVLW for OSCCAL),
> - if not using _MCLRE_OFF,
>         - check GP3 is not used,
>
> --
> James Cameron                              (james.cameron@digital.com)
> Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800