hi I work by LPC2138/01, and i config I/O ports as fast I/O(SCS=0x3). i change I/O pin in simulation exactly, also I/O pins change whitout any problem in run mode. but i cannot change I/O pin in debugging mode, even when i click a bit on PINxDIR register manually, it unchecked after a short time. I use Keil V4.6.00. How can I solve my problem by fast I/O pin in debug mode???
But are you clicking any registers in any dialogs when running on real hardware?
when i click on any register, no problem. (even slow GPIO dialog) just when i click on any fast GPIO registers, it becomes unchecked after short time.
But the registers you see in the dialogs takes input from two directions - your clicks, and any changes that are the result of your program.