Hi,
Trying for few days to port a well behaved rfid card reader program from atmel 89c55wd to p89lpc921 with no sucess. Does any of you have experience what can go wrong in such case. I suspect there must be something with timing.
I checked everything that came to my mind (use of instructions for micro timing, etc). Is there a "compatibility" mode to get lpc to behave like standard x51 in terms of instruction execution (and timer T1 opperation)? Flash magic has a checkbox "6 clok cycle" but I could not find in DS and UM what that is..
Any hint would be welcome.

Thank's

H.Sodan