STEP 5 Operations S5-115F Manual
ExplanationSTL
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L IW 12
CSW
T DW 100
Load the contents of input word IW 12 into ACCUM 1.
Invert all bits. Add a ”1” at the least significant position.
Transfer the altered word to data word DW 100.
+1
CSW
015
Numeric Example
Form the negative value of the
value in input word IW 12.
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1 0 1 0 0 1 1 0 0 0 1 1 1 0 1 1
15 0
0 1 0 1 1 0 0 1ACCUM 1
ACCUM 1
IW 12
1 1 0 0 0 1 0 1
3.2.7 Decrement/Increment
The decrement/increment operations change the data loaded into ACCUM 1. Table 3-17 provides
an overview of the decrement/increment operations. An example follows the table.
Table 3-17. Decrement/Increment Operations
Operation Meaning
Parameter 0 to 255
Operand
D
I
Decrement
Decrement the contents of the accumulator.
Increment
Increment the contents of the accumulator.
The contents of ACCUM 1 are either decremented or incremented
by the number indicated in the parameter.
Execution of the operation is unconditional and is limited to the
right-hand byte (without carry).
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Processing
Execution of the decrement and increment operations is independent of the RLO and does not
affect the RLO or the condition codes.
The parameter indicates the value by which the contents of ACCUM 1 are to be changed. The
operations refer to decimal values; however, the result is stored in ACCUM 1 in binary form.
Changes relate only to the low byte in the accumulator.
3-52
EWA 4NEB 811 6149-02
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