Omron FQM1-MMA21, FQM1-CM001 One-shotPulse Output Function, Pulse Outputs, Section, Formula

Pulse Outputs Section 7-6

Clock-generated pulses (one of four possible settings)

Integer dividing ratio set according to the target frequency set by user.

Output pulses

(Actual output frequency)

Dividing circuit

Formula:

Actual frequency = Clock frequency ⎟ INT (clock frequency/target frequency)

Note INT (clock frequency/target frequency) is the dividing ratio.

The difference between the target frequency and the actual frequency increases at higher frequencies. The following tables shows examples for a clock frequency of 20 MHz.

Target frequency (Hz)	Actual output frequency
952,382 to 1,000,000	1,000,000
909,092 to 952,381	952,381
869,566 to 909,091	909,091
.	.
.	.
.	.
487,806 to 500,000	500,000
476,191 to 487,805	487,805
465,117 to 476,190	476,190
.	.
.	.
.	.
198,021 to 200,000	100,806
196,079 to 198,020	198,020
194,176 to 196,078	196,078
.	.
.	.
.	.
49,876 to 50,000	50,000
49,752 to 49,875	49,875
4,929 to 49,751	49,751
.	.
.	.
.	.
402	402
401	401
400	400

7-6-7 One-shot Pulse Output Function

The one-shot pulse output function turns ON the output only for a specified time between 0.01 and 9,999 ms. Use the STIM(980) instruction to start the pulse output (turn the output from OFF to ON). After the time specified in STIM(980) has elapsed, the pulse output is automatically turned OFF (in the hardware).

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