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Symbol Math Instructions Section 3-11
Description +L(401) adds the binary values in Au and Au+1 and Ad and Ad+1 and outputs
the result to R.
Flags
Precautions When +L(401) is executed, the Error Flag will turn OFF.
If as a result of the addition, the content of R, R+1 is 00000000 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
80000000 to FFFFFFFF hex), the Overflow Flag will turn ON.
If the result of adding two negative numbers is positive (in the range
00000000 to 7FFFFFFF hex), the Underflow Flag will turn ON.
If as a result of the addition, the content of the leftmost bit of R+1 is 1, the
Negative Flag will turn ON.
Examples When CIO 000000 is ON, D00100 and D00110 and D00111 and D00110 will
be added as 8-digit signed binary values and the result will be output to
D00120 and D00120.
R+1CY
+
R
Au+1
Ad+1
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 80000000 to FFFFFFFF hex.
OFF in all other cases.
Underflow Flag UF ON when the result of adding two negative numbers is in
the range 00000000 to 7FFFFFFF 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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