Omron CS1G/H-CPUxxH Instructions Manual page 395

Symbol Math Instructions
Description
Flags
Precautions
Examples
374
+(400) adds the binary values in Au and Ad and outputs the result to R.
+
CY will turn
ON when there
CY
is a carry.
Name Label
Error Flag ER
Equals Flag =
Carry Flag CY
Overflow Flag OF
Underflow Flag UF
Negative Flag N
When +(400) is executed, the Error Flag will turn OFF.
If as a result of the addition, the content of R is 0000 hex, the Equals Flag will
turn ON.
If the addition results in a carry, the Carry Flag will turn ON.
If the result of adding two positive numbers is negative (in the range 8000 to
FFFF hex), the Overflow Flag will turn ON.
If the result of adding two negative numbers is positive (in the range 0000 to
7FFF hex), the Underflow Flag will turn ON.
If as a result of the addition, the content of the leftmost bit of R is 1, the Nega-
tive Flag will turn ON.
When CIO 000000 is ON in the following example, D00100 and D00110 will
be added as 4-digit signed binary values and the result will be output to
D00120.
(Signed binary)
Au
(Signed binary)
Ad
(Signed binary)
R
Operation
OFF
ON when the result is 0.
OFF in all other cases.
ON when the addition results in a carry.
OFF in all other cases.
ON when the result of adding two positive numbers is in
the range 8000 to FFFF hex.
OFF in all other cases.
ON when the result of adding two negative numbers is in
the range 0000 to 7FFF hex.
OFF in all other cases.
ON when the leftmost bit of the result is 1.
OFF in all other cases.
Section 3-11