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11-13
11 High-speed Counters
CP2E CPU Unit Software User’s Manual(W614)
11-2 High
-sp
eed C
oun
ter In
pu
ts
11
1
1-2-5
F
re
quency Measurement
This function measures the frequency of the high-speed counter (input pulses.)
The input pulse frequency can be read by executing the PRV instruction. The measured frequency is
output in
8 -digit hexadecimal and expressed in Hz. The frequency measurement function can be used
with high-speed counter 0 only.
The frequency can be measured while a high-speed counter 0 comparison operation is in progress.
Frequency measurement can be performed at the same time as functions such as the high-speed
counter and pulse output without affecting the performance of those functions.
z
Reading the High-speed Counter Frequency with a PRV Instruction
Precautions for Correct Use Precautions for Correct Use
The frequency measurement function can be used with high-speed counter 0 only.
z
Specifications
* If the frequency exceeds the maximum value, the maximum value will be stored.
11-2-5 Frequency Measurement
Overview
Item Specifications
Number of frequency mea-
surement inputs 1 input (high-speed counter 0 only)
Frequency measurement
range High-speed counter 0:
Differential phase inputs: 0 to 50 kHz
All other input modes: 0 to 100 kHz
Measurement method Execution of the PRV instruction
Stored data Unit Hz
Output data
range* Differential phase input: 0000 0000 to 000 3 0D40 hex (0 to 200 kHz)
All other input modes: 0000 0000 to 0001 8 6A0 hex (0 to 100 kHz)
@PRV
#0010
#0013
D100
15 0
D100
D101
Present fre qu ency
data u pper b ytes
Exec u tion condition
C1: Port specifier (example for high-speed co u nter inp u t 0 (fixed))
C2: Control data for reading fre qu ency (10-ms sampling)
S: First destination w ord
Present fre qu ency
data lo w er b ytes High-speed co u nter fre qu ency
that w as read