STEP 5 Operations S5-115F Manual
Condition code generation for comparison operations
Execution of comparison operations sets condition codes CC 0 and CC 1 ( Table 3-30). The
overflow condition code is not affected. However, comparison operations affect the RLO. When a
comparison is satisfied, the RLO is 1. Consequently, the conditional jump operation ”JC” can also
be used after a comparison operation.
Table 3-30. Condition Code Settings for Comparison Operations
Possible
jump operations
OVCC 0CC 1
Condition codesContents of ACCUM 2 as
compared to contents
of ACCUM 1
Equal to 0 0
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Less than
Greater than
JZ
JN, JM
JN, JP
0
1
1
0
Condition code generation for arithmetic operations
Execution of arithmetic operations sets all condition codes according to the result of the arith-
metic operation ( Table 3-31).
Table 3-31. Condition Code Settings for Fixed-Point Arithmetic Operations
Possible
jump operations
OVCC 0CC 1
Condition codesResult after
arithmetic operation
is executed
1 0 1< - 32768
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a
- 32768 to - 1
0
+1 to +32767
> +32767
(-) 65536 *
0
0
1
0
0
1
0
0
1
0
0
0
0
1
1
JN, JP, JO
JN, JM
JZ
JN, JP
JN, JM, JO
JZ, JO
* This number is the result of the calculation -32768 - 32768
Conditon code generation for digital logic operations
Digital logic operations set CC 0 and CC 1. They do not affect the overflow condition code
( Table 3-32). The setting depends on the contents of the ACCUM after the operation has been
processed.
Table 3-32. Condition Code Settings for Digital Logic Operations
Possible
jump operations
OVCC 0CC 1
Condition codes
Value of
the last bit
shifted out
Zero (KH = 0000) 0 0 JZ
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Not zero 1 0 JN, JP
3-70
EWA 4NEB 811 6149-02
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