Omron CS1G/H-CPUxxH Instructions Manual page 399

Symbol Math Instructions
Description
Flags
Precautions
Examples
378
+C(402) adds the binary values in Au, Ad, and CY and outputs the result to R.
CY will turn
ON when there
CY
is a carry.
Name
Error Flag ER
Equals Flag =
Carry Flag CY
Overflow Flag OF
Underflow Flag UF
Negative Flag N
When +C(402) 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 and CY is negative (in the range
8000 to FFFF hex), the Overflow Flag will turn ON.
If the result of adding two negative numbers and CY 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.
Note To clear the Carry Flag (CY), execute the Clear Carry (CLC(041)) instruction.
When CIO 000000 is ON, D00100, D00110, and CY will be added as 4-digit
signed binary values and the result will be output to D00220.
(Signed binary)
Au
(Signed binary)
Ad
CY
+
(Signed binary)
R
Label
OFF
ON when the addition result is 0.
OFF in all other cases.
ON when the addition results in a carry.
OFF in all other cases.
ON when the addition result of adding two positive num-
bers and CY is in the range 8000 to FFFF hex.
OFF in all other cases.
ON when the addition result of adding two negative num-
bers and CY 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
Operation