427
Symbol Math Instructions Section 3-11
Description +(400) adds the binary values in Au and Ad and outputs the result to R.
Flags
Precautions 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.
Examples 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.
RCY
+
Au
Ad
(Signed binary)
(Signed binary)
(Signed binary)
CY will turn
ON when there
is a carry.
Name Label Operation
Error Flag ER OFF
Equals Flag = ON when the 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 result of adding two positive numbers is in
the range 8000 to FFFF hex.
OFF in all other cases.
Underflow Flag UF ON when the result of adding two negative numbers 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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