362
Symbol Math Instructions Section 3-10
Description –B(414) subtracts the BCD values in Su from Mi and outputs the result to R. If
the result of the subtraction is negative, the result is output as a 10’s comple-
ment.
Flags
Precautions If Mi and/or Su are not BCD, an error is generated and the Error Flag will turn
ON.
If as a result of the subtraction, the content of R is 0000 hex, the Equals Flag
will turn ON.
If an addition results in a borrow, the Carry Flag will turn ON.
Examples When CIO 0.00 is ON in the following example, D110 will be subtracted from
D100 as 4-digit BCD values, and the result will be output to D120.
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants 0000 to 9999 (BCD) ---
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
RCY
–
(BCD)
(BCD)
(BCD)
Mi
Su
CY will turn
ON when there
is a borrow.
Name Label Operation
Error Flag ER ON when Mi is not BCD.
ON when Su is not BCD.
OFF in all other cases.
Equals Flag = ON when the result is 0.
OFF in all other cases.
Carry Flag CY ON when the subtraction results in a borrow.
OFF in all other cases.
0.00
D100
D110
D120
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