Is there any caveat's with the LPC series
of course, as with any uC series; However I can not think of one except the original 932 which has been replaced by the 932A2, a 'clean' version. As you, Per, is not known for shopping in the corner antique store for chips, that should not be a problem.

How much effort would have to be put in implementing a simple PCF8574 type i/o in software (C). I have had a look on Code architect wich seens to be a nice tool.

The CodeArchitect produce very good code, the only 'work' you need to do is removing what you do not need. I have asked that they make a 'slave/master/both' option on the IIC, that has, as far as I know, not happened. However, 5 minutes of study makes it easy to see what to remove and what not.

One final note: for IIC and the LPC DO get the datasheet for the P89C668 or P8966x it has the only COMPLETE, UNABRIDGED, FULL specification of the IIC on the LPCs which is identical except for the clocking.

Of course, I 'mutilated' the CodeArchitect code to add a bit and make it match my style and, in the process of making that work, had I not used the 668 datasheet, I might have been debugging still :)

Erik

PS for LPC93x users: the P89LPC953 sell on DigiKey for $0.02 more than the P89LPC932A2, why not spend the $0.02

my $0.02 worth :)