The input filter function has a restriction on the width of input pulses.
X0, X2, X4, X6 Terminals
There is an input delay time of 5 microseconds for ON→OFF and 5 microseconds for OFF→ON. When running sampling every 0.5 milliseconds, 5 microseconds (ON→OFF) + 0.5 milliseconds (Sampling Interval) + 5 microseconds (OFF→ON) = 0.51 milliseconds
As a result, 0.51 milliseconds is the limit for the smallest input pulse width.
X1, X3, X5, X7, X8, X9, X10, X11 Terminals
There is an input delay time of 0.5 milliseconds for ON→OFF and 5 milliseconds for OFF→ON.
When running sampling every 0.5 milliseconds
0.5 milliseconds (ON→OFF) + 0.5 milliseconds (Sampling Interval) + 0.5 milliseconds (OFF→ON) = 1.5 milliseconds
As a result, 1.5 milliseconds is the limit for the smallest input pulse width.