On Thu, 2 Sep 1999, [ISO-8859-1] Ruben Jönsson wrote:

> Hello,
> 
> I have just read the (preliminary) data sheet for the
> new PIC18CXXX chip, which I find very impressive.
> If the price is right this will definitely be included
> in some of my future designs.

Exactly my feelings too.

> 
> Now to my question - The chip has instructions for table
> read and table write of the program memory. Table read
> I understand (lookup tables, ROM checksum ...), but not
> the table write. Is it possible to write to the program
> memory during program execution? As I understand it, the
> chip is based on EPROM, which in a plastic package is OTP.
> If it would have been EEPROM or FLASH it would have been
> great (a lot of non volatile memory on chip).
> 
> Is this for programming the chip or a feature which will
> be usable first when there is FLASH or EEPROM versions
> of it?

According to section 5.1.1, the section about the RCON register, the
TBLWRT is applicable when Vpp is applied to the /MCLR pin.

Now my turn.
How do you think this instruction will execute?:

  movff  postdec0,preinc0

Scott