3. Instructions
390
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Function
SIGN(600) converts the 16-bit signed binary number in S to its 32-bit signed binary equivalent and
writes the result in R+1 and R.
The conversion is accomplished by copying the content of S to R and writing FFFF to R+1 if bit 15 of S
is 1 or writing 0000 to R+1 if bit 15 of S is 0.
Example Programming
When CIO 0.00 is ON in the following example, SIGN(600) converts the 16-bit signed binary content of
D100 (#8000 = -32,768 decimal) to its 32-bit equivalent (#FFFF 8000 = -32,768 decimal) and writes
that result to D201 and D200.
10000 0000 0000 000
100 000000 000 0000
111 1111 1111 111 11
The content of S is
transferred "as is" to R.
Source word (S)
1
st
result word (R)
2
nd
result word (R+1)
If bit 15 of S is 1, FFFF is transferred to R+1.
If bit 15 of S is 0, 0000 is transferred to R+1.
Example: 8000 Hex
D100
D200
0.00
D: D200
S: D100
D+1: D201
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