340
Symbol Math Instructions Section 3-10
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 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.
Index Registers IR0 to IR15
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
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 00000000 to 7FFFFFFF 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.
0.01
D200
D210
D220
To Next Page
Loading...
