Reference
Programming Reference
B–21
Instruction Execution Times and Memory Usage
The table below lists the execution times and memory usage for the controller
instructions. Any instruction that takes longer than 15
µ
s (true or false execution
time) to execute performs a poll for user interrupts.
Mnemonic
False Execution
Time (approx.
µ
seconds)
True Execution
Time (approx.
µ
seconds)
Memory Usage
(user words)
Name
Instruction Type
ADD
6.78
33.09
1.50
Add
Math
AND
6.78
34.00
1.50
And
Data Handling
BSL
19.80
53.71 + 5.24 x
position value
2.00
Bit Shift Left
Application
Specific
BSR
19.80
53.34 + 3.98 x
position value
2.00
Bit Shift Right
Application
Specific
CLR
4.25
20.80
1.00
Clear
Math
COP
6.60
27.31 + 5.06/word
1.50
File Copy
Data Handling
CTD
27.22
32.19
1.00
Count Down
Basic
CTU
26.67
29.84
1.00
Count Up
Basic
DCD
6.78
27.67
1.50
Decode 4 to 1 of
16
Data Handling
DDV
6.78
157.06
1.00
Double Divide
Math
DIV
6.78
147.87
1.50
Divide
Math
ENC
6.78
54.80
1.50
Encode 1 of 16 to
4
Data Handling
EQU
6.60
21.52
1.50
Equal
Comparison
FFL
33.67
61.13
1.50
FIFO Load
Data Handling
FFU
34.90
73.78 + 4.34 x
position value
1.50
FIFO Unload
Data Handling
FLL
6.60
26.86 + 3.62/word
1.50
Fill File
Data Handling
FRD
5.52
56.88
1.00
Convert from BCD
Data Handling
GEQ
6.60
23.60
1.50
Greater Than or
Equal
Comparison
GRT
6.60
23.60
1.50
Greater Than
Comparison
HSC
21.00
21.00
1.00
High-Speed
Counter
High-Speed
Counter
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