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304
Comparison Instructions
Section 3-7
Description
CMP(020) compares the unsigned binary data in S
1
and S
2
and outputs the
result to Arithmetic Flags (the Greater Than, Greater Than or Equal, Equal,
Less Than or Equal, Less Than, and Not Equal Flags) in the Auxiliary Area.
Condition Flag Status
The following table shows the status of the Arithmetic Flags after execution of
CMP(020). (A status of “---” indicates that the Flag may be ON or OFF.)
Using CMP(020) Results in the Program
When CMP(020) is executed, the result is reflected in the Arithmetic Flags.
Control the desired output or right-hand instruction with a branch from the
same input condition that controls CMP(020), as shown in the following dia-
gram. In this case, the Equals Flag and output A will be turned ON when S
1
=
S
2
.
Using CMP(020) Results in the Program
Do not program another instruction between CMP(020) and the instruction
controlled by the Arithmetic Flag because the other instruction might change
the status of the Arithmetic Flag. In this case, the results of instruction B might
change the results of CMP(020).
Index Registers
---
Indirect addressing using
Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area
S
1
S
2
CMP(020)
Result
Flag status
>
> =
=
< =
<
< >
S
1
> S
2
ON
ON
OFF
OFF
OFF
ON
S
1
= S
2
OFF
ON
ON
ON
OFF
OFF
S
1
< S
2
OFF
OFF
OFF
ON
ON
ON
(>, >=, =, <=, <, <>)
Unsigned binary
comparison
Arithmetic Flags
CMP
S1
S2
A
Arithmetic Flag
(Example: Equal Flag)
Correct Use of CMP(020)
Summary of Contents for SYSMAC CS Series
Page 2: ......
Page 4: ...iv ...
Page 30: ...xxx ...
Page 186: ...146 List of Instructions by Function Code Section 2 4 ...
Page 1320: ...1280 Model Conversion Instructions Unit Ver 3 0 or Later Section 3 35 ...
Page 1390: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...
Page 1391: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits ...
Page 1392: ...1352 ASCII Code Table Appendix A ...
Page 1404: ...1364 Revision History ...