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443
Symbol Math Instructions
Section 3-11
Precautions
When –(410) is executed, the Error Flag will turn OFF.
If as a result of the subtraction, the content of R is 0000 hex, the Equals Flag
will turn ON.
If the subtraction results in a borrow, the Carry Flag will turn ON.
If the result of subtracting a negative number from a positive number is nega-
tive (in the range 8000 to FFFF hex), the Overflow Flag will turn ON.
If the result of subtracting a positive number from a negative number is posi-
tive (in the range 0000 to 7FFF hex), the Underflow Flag will turn ON.
If as a result of the subtraction, the content of the leftmost bit of R is 1, the
Negative Flag will turn ON.
Examples
When CIO 000000 is ON in the following example, D00110 will be subtracted
from D00100 as 4-digit signed binary values and the result will be output to
D00120.
3-11-10 DOUBLE SIGNED BINARY SUBTRACT WITHOUT CARRY: –L(411)
Purpose
Subtracts 8-digit (double-word) hexadecimal data and/or constants.
Ladder Symbol
Variations
Applicable Program Areas
Carry Flag
CY
ON when the subtraction results in a borrow.
OFF in all other cases.
Overflow Flag
OF
ON when the result of subtracting a negative number from
a positive number is in the range 8000 to FFFF hex.
OFF in all other cases.
Underflow Flag
UF
ON when the result of subtracting a negative number from
a positive number is in the range 0000 to 7FFF hex.
OFF in all other cases.
Negative Flag
N
ON when the leftmost bit of the result is 1.
OFF in all other cases.
Name
Label
Operation
−
−
L(411)
R
Mi
Su
Mi
: Minuend word
Su
: Subtrahend word
R
: Result word
Variations
Executed Each Cycle for ON Condition
–L(411)
Executed Once for Upward Differentiation
@–L(411)
Executed Once for Downward Differentiation
Not supported.
Immediate Refreshing Specification
Not supported.
Block program areas
Step program areas
Subroutines
Interrupt tasks
OK
OK
OK
OK
Содержание SYSMAC CS1D-CPU**
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Страница 185: ...146 List of Instructions by Function Code Section 2 4...
Страница 193: ...154 3 35 4 MOVE BIT MOVBC 568 1274 3 35 5 BIT COUNTER BCNTC 621 1276 3 35 6 GET VARIABLE ID GETID 286 1278...
Страница 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Страница 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
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