Hi,
After study PWM example code of LPCOpen 3.0.3 for LPC11U68, it is recommended that some of the value should be updated to avoid confusion. Yes, the function performed as expected but the register setting weren't consistent with description on comments.
in sct_pwm.c (line 124)
/* Setup match counter 0 for the number of ticks in a PWM sweep, event 0
will be used with the match 0 count to reset the counter. */
LPC_SCT1->MATCH[0].U = cycleTicks;
LPC_SCT1->MATCHREL[0].U = cycleTicks;
LPC_SCT1->EVENT[0].CTRL = 0x00001000; // ==> suggested to be (1 << 12)
LPC_SCT1->EVENT[0].STATE = 0xFFFFFFFF; // ==> suggested to be "1" for stateless (ref: 18.6.23 of UM10732)
LPC_SCT1->LIMIT_L = (1 << 0);
(line 181)
/* Don't use states */
LPC_SCT1->STATE_L = 0; // So this is a stateless example
