254
Pulse Outputs Section 5-3
Equations
The INT function extracts an integer from the fraction. The non-integer
remainder is rounded.
Differences between Set Frequencies and Actual Frequencies
Source clock frequency
Dividing ratio
(Clock frequency x 2) + Set frequency
Set frequency (kHz) x 2
Actual frequency (kHz) =
Dividing ratio = INT
• Port 0/1 (Source clock frequency: 20 MHz) • Port 2/3 (Source clock frequency: 16.4 MHz)
Set frequency (kHz) Actual frequency (kHz) Set frequency (kHz) Actual frequency (kHz)
20 975.609 to 1000.000 1000.000
21 930.232 to 975.609 952.380
22 888.888 to 930.232 909.090
::
39 506.329 to 519.480 512.820
40 493.827 to 506.329 500.000
41 481.927 to 493.827 487.804
::
99 201.005 to 203.045 202.020
100 199.004 to 201.005 200.000
101 197.044 to 199.004 198.019
::
200 99.750 to 100.250 100.000 164 99.696 to 100.000 100.000
201 99.255 to 99.750 99.502 165 99.093 to 99.696 99.393
202 98.765 to 99.255 99.009 166 98.498 to 99.093 98.795
:: : :
399 50.062 to 50.188 50.125 327 50.076 to 50.229 50.152
400 49.937 to 50.062 50.000 328 49.923 to 50.076 50.000
401 49.813 to 49.937 49.875 329 49.772 to 49.923 49.848
:: : :
999 20.010 to 20.030 20.020 819 20.012 to 20.036 20.024
1000 19.990 to 20.010 20.000 820 19.987 to 20.012 20.000
1001 19.970 to 19.990 19.980 821 19.963 to 19.987 19.975
:: : :
1999 10.002 to 10.007 10.005 1639 10.003 to 10.009 10.006
2000 9.997 to 10.002 10.000 1640 9.996 to 10.003 10.000
2001 9.992 to 9.997 9.995 1641 9.990 to 9.996 9.993
:: : :
3999 5.000 to 5.001 5.001 3279 5.000 to 5.002 5.001
4000 4.999 to 5.000 5.000 3280 4.999 to 5.000 5.000
4001 4.998 to 4.999 4.998 3281 4.997 to 4.999 4.998
:: : :
6663 3.001 to 3.001 3.001 5464 3.001 to 3.001 3.001
6665 3.000 to 3.000 3.000 5466 3.000 to 3.000 3.000
6668 2.999 to 2.999 2.999 5468 2.998 to 2.999 2.999
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