We can confirm this "feature" and yes, it will exist on the 17C756.
     
     I have forwarded this to the folks who do the simulator to get a 
     match.  Sorry about missing the message the first time.
     
     Rgds, Brian.


______________________________ Reply Separator _________________________________
Subject: Table Read/Write feature of 17C5xx
Author:  Wolfram Liebchen <liebchen@FFO.FGAN.DE> at Internet_Exchange
Date:    3/4/97 2:40 PM


Hi all,
     
some time ago, I posted, that there is a difference between manual/simulator 
and the real-world 17C44:
     
  The table latch used for Table-Reads and Table-Writes are different, 
  that is, you cannot table-read a double-byte value, write a new 
  value into one of the table latch halves and table-write them back 
  into RAM / EPROM. The second - unaffected - byte will be filled with 
  an arbitrary value - resulting from an earlier action.
  The simulator (and the manual too) allows this simplified read-modify- 
  write cycle, but the 17C44 doesn't.
     
Does anybody know, if the new released 17C5xx has the same "feature"?
     
(It's a pity, that Microchip has never responded - neither to my 
posting nor to a direct email...)
     
regards,
     
Wolfram
     
     
+-----------------------------------------------------+ 
| Wolfram Liebchen                                    | 
| Forschungsinstitut für Optik, Tübingen, Deutschland | 
| mailto:liebchen@ffo.fgan.de                         | 
+-----------------------------------------------------+