Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 373

Symbol Math Instructions
Description
Flags
Precautions
Examples
340
Area
Index Registers
Indirect addressing
using Index Registers
+L(401) adds the binary values in Au and Au+1 and Ad and Ad+1 and outputs
the result to R.
Au+1
Ad+1
+
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 +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.
When CIO 0.01 is ON, D200 and D201 and D211 and D210 will be added as
8-digit signed binary values and the result will be output to D221 and D220.
0.01
D200
D210
D220
Au
IR0 to IR15
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
(Signed binary)
Au
(Signed binary)
Ad
R+1 R
(Signed binary)
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 00000000 to 7FFFFFFF hex.
OFF in all other cases.
ON when the result of adding two negative numbers is in
the range 00000000 to 7FFFFFFF hex.
OFF in all other cases.
ON when the leftmost bit of the result is 1.
OFF in all other cases.
Section 3-10
Ad R