431
Symbol Math Instructions Section 3-11
Description +C(402) adds the binary values in Au, Ad, and CY and outputs the result to R.
Flags
Precautions 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.
Examples 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.
CY
+
RCY
Au
Ad
(Signed binary)
(Signed binary)
(Signed binary)
CY will turn
ON when there
is a carr
.
Name Label Operation
Error Flag ER OFF
Equals Flag = ON when the addition result is 0.
OFF in all other cases.
Carry Flag CY ON when the addition results in a carry.
OFF in all other cases.
Overflow Flag OF 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.
Underflow Flag UF 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.
Negative Flag N ON when the leftmost bit of the result is 1.
OFF in all other cases.
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