Keil's 'C' doesn't have one, which is probably the reason Erik doesn't like simulators. The one they offer is sort-of useable, at least with some MCU's, but doesn't provide several key features and, some of them have, in the past, in fact, been misleading.

Until JTAG and ICE's support echoing to the console in real time, and provide people with the ability to read and type at the execution speed of the MCU, those won't be the "be-all and end-all" either.

However, it is, with all the various different clock rates, etc, vital that the simulator generate information about precise timing details, long-term trace, and file-based scheduled simulation of external inputs, so that detailed information about such things as interrupt response at different points in the code execution sequence can be extracted by simulation. While this is additional work for the programmer, it provides information not available using JTAG or ICE's.

RE