Omron CP - PROGRAMMING MANUAL 05-2007 - Page 371

338
Symbol Math Instructions Section 3-10
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.
Constants #0000 to #FFFF (binary)
&0 to &65535 (unsigned decimal)
−32768 to 0 to 32767 (signed decimal)
---
Data Registers DR0 to DR15
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area Au Ad R
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.