STEP 5 Operations S5-95F
8.4 Condition Code Generation
The processor of the programmable controller has the following three condition codes:
• CC 0
• CC 1
• OV (overflow)
The following operations affect the condition codes.
• Comparison operations
• Arithmetic operations
• Shift operations
• Some conversion operations
The state of the condition codes represents a condition for the various jump operations.
Condition Code Generation for Comparison Operations
Execution of comparison operations sets condition codes CC 0 and CC 1 (see Table 8-30). The
overflow condition code is not affected. Comparison operations do affect the RLO. When a
comparison is satisfied, the RLO is 1. This allows you to use the “JC” conditional jump operation
after a comparison operation.
Table 8-30. Condition Code Settings for Comparison Operations
OVCC 0CC 1
Condition Codes
Contents of ACCU 2 as
Compared to Contents
of ACCU 1
Equal to 0 0
Less than
Greater than
JZ
JN, JM
JN, JP
0
1
1
0
Possible
Jump Operations
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Condition Code Generation for Arithmetic Operations
Execution of arithmetic operations sets all condition codes according to the result of the arithmetic
operation (see Table 8-31).
Table 8-31. Condition Code Settings for Fixed-Point Arithmetic Operations
*
This number is the result of the calculation -32768 - 32768
JN, JM
OVCC 0CC 1
Condition Codes
Result after
Arithmetic Operation
is Executed
1 0
+1 to +32767
> +32767
(-) 65536*
0
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0
1
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0
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0
1
1
JZ
JN, JP
JN, JM, JO
JZ, JO
JN, JP, JO1< - 32768
- 32768 to - 1
0
Possible
Jump Operations
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8-68
EWA 4NEB 812 6210-02
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