>>> Microchip do not make it very clear in their selction tables, but you 
need
>>> to look for "Enhanced
>>> flash" rather than "Standard Flash" - Enhanced means it can do self
>>> programming and LVP.
>>> This is further confused by some errors in the tables - e.g. 18Fx52 is
>>> incorrectly listed as
>>> standard flash.
>>
>>Sorry, this is _not_ the distinction between standard and enhanced flash.
>>IIRC the enhanced flash has better endurance numbers (10x better?), and a
>>few other improvements.
>>
>>Self-programmability is orthogonal to the standard/advanced flash issue.
>
> It seems to correspond on all the devices I've looked at the datasheets 
> for, as does the
> correspondance between having LVP and self-programming - this makes sense, 
> implying that the
> difference is down to whether or not the chip has a charge-pump. If the 
> latter is the always the
> case then looking for a PGM pin in the pinout is a quick way to identify 
> self-programmable parts.
>
> There are errors in this column of the parametric tables on the Microhip 
> website, where it differs
> from what the datasheet says, and there are datasheets which do not 
> mention self-programming on the
> front page but do describe the Table Write procedure in the relevant 
> section of the DS.
>
> I'm not saying you are wrong but can you give an example of a device where 
> standard/enhanced (in the
> datasheet, not the tables) does not correspond to  able/unable to do 
> self-programming ?

The PIC16F87X (not A) is not enhanced flash, but it can self program.

Bob Ammerman
RAm Systems


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