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2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)
Floating-point Math
Instructions
2
FSTR
• Limits on the Number of Digits in the Integer Part
1) Decimal Notation (C = 0 hex)
• When there is no fractional part (C+2 = 0 hex):
1 ≤ Number of Integer Digits ≤ 24-1
• When there is a fractional part (C+2 = 1 to 7 hex):
1 ≤ Number of Integer Digits ≤ (24 - Fractional digits - 2)
2) Scientific Notation (C = 1 hex)
1 digit (fixed)
• Limits on the Number of Digits in the Fractional Part
1) Decimal Notation (C = 0 hex)
• Fractional Digits ≤ 7
• Also: Fractional Digits ≤ (Total Number of ASCII Characters - 3)
2) Scientific Notation (C =1 hex)
• Fractional Digits ≤ 7
• Also: Fractional Digits ≤ (Total Number of ASCII Characters - 7)
Sample program
Converting to ASCII Text in Decimal Notation
When CIO 0.00 is ON in the following example, FSTR(448) converts the floating-point data in D1 and
D0 to decimal-notation ASCII text and writes the ASCII text to the destination words beginning with
D100. The contents of the control words (D10 to D12) specify the details on the data format (decimal
notation, 7 characters total, 3 fractional digits).
20(Space)
2E(.)
32(2)
00
1010100001110010
0011111010100111
0.00
15 0
D0
D1
0(Hex)
7(Hex)
3(Hex)
D10
D11
D12
0.327457
20(Space)
30(0)
33(3)
37(7)
D100
D101
D102
D103
0 .327457
FSTR
D0
D10
D100
Conversion
Storage
conditions
Decimal notation
Total characters = 7 characters
Fractional digits = 3 digits (characters)
Total number of characters
Rounded off
Spaces Fractional part