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Increment/Decrement Instructions Section 3-9
Description The ++B(594) instruction adds 1 to the BCD content of Wd. The specified
word will be incremented by 1 every cycle as long as the execution condition
of ++B(594) is ON. When the up-differentiated variation of this instruction
(@++B(594)) is used, the specified word is incremented only when the execu-
tion condition has gone from OFF to ON.
The Equals Flag will be turned ON if the result is 0000 and the Carry Flag will
be turned ON when a digit changes from 9 to 0.
Both the Equals Flag and the Carry Flag will be turned ON when the content
of Wd changes from 9999 to 0000.
Flags
Precautions The content of Wd must be BCD. If it is not BCD, an error will occur and the
Error Flag will be turned ON.
Examples Operation of ++B(594)
In the following example, the BCD content of D100 will be incremented by 1
every cycle as long as CIO 0.00 is ON.
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 Wd
Wd Wd
Name Label Operation
Error Flag ER ON if the content of Wd is not BCD.
OFF in all other cases.
Equals Flag = ON if the content of Wd is 0000 after execution.
OFF in all other cases.
Carry Flag CY ON if a digit in Wd went from 9 to 0 during execution.
OFF in all other cases.
D100 D100
0.00
CIO 0.00
D100
Increment Increment Increment
Increment
Wd: Wd:
: Execution of ++B(594)
Incremented every cycle
while CIO 0.00 is ON.
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