Hello. I can't set system clock rate to specific values, resp. I am not sure how to interpret returned values. Sample code: int ticksPerSecond = 80; //396000000; int status = sysClkRateSet(ticksPerSecond); if (status == OK) { printf("rate set: OK\n"); } else { printf("rate set: ERROR\n"); } int rate = sysClkRateGet(); printf("sysClkRateGet: %d\n",rate); char ch = getchar(); A default value returned from sysClkRateGet() is 60 for the board simulator, resp. 50 for the default simulator (vxsim0). The range of possible rate values is 1 to 5000 for the board simulator, resp. 2 to 100 for the default simulator (vxsim0). I would expect to set the rate to a value such as 396 000 000 (that is the board's cpu clock rate). Am I wrong? Thanks for reply. Lukac