Omron SYSMAC CJ - REFERENCE MANUAL 08-2008

447
Symbol Math Instructions Section 3-11
Description –C(412) subtracts the binary values in Su and CY from Mi, and outputs the
result to R. When the result is negative, it is output to R as a 2’s complement.
Flags
Timer Area T0000 to T4095
Counter Area C0000 to C4095
DM Area D00000 to D32767
EM Area without bank E00000 to E32767
EM Area with bank En_00000 to En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants #0000 to #FFFF
(binary)
---
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 Mi Su R
CY
–
RCY
Mi
Su
(Signed binary)
(Signed binary)
(Signed binary)
CY will turn
ON when there
is a borrow.
Name Label Operation
Error Flag ER OFF
Equals Flag = ON when the subtraction result is 0.
OFF in all other cases.
Carry Flag CY ON when the subtraction results in a borrow.
OFF in all other cases.
Overflow Flag OF ON when the result of subtracting a negative number and
CY from a positive number is in the range 8000 to FFFF
hex.
OFF in all other cases.
Underflow Flag UF ON when the result of subtracting a positive number and
CY from a negative number 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.