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369
Increment/Decrement Instructions
Section 3-10
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 0 to 9.
Flags
Precautions
The content of Wd must be BCD. If it isn’t BCD, an error will occur and the
Error Flag will be turned ON.
Examples
Operation of – –B(596)
In the following example, the BCD content of D00100 will be decremented by
1 every cycle as long as CIO 000000 is ON.
Operation of @– –B(596)
The up-differentiated variation is used in the following example, so the BCD
content of D00100 will be decremented by 1 only when CIO 000000 has gone
from OFF to ON.
−
1
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 0 to 9 during execution.
OFF in all other cases.
Decremented every cycle
while CIO 000000 is ON.
: Execution of
− −
B(596)
Decrement Decrement Decrement Decrement
Wd: D00100
Wd: D00100
−
1
Decremented only
for up-differentiation.
: Execution of @
− −
B(596)
Decrement
Decrement
@
− −
B
Wd: D00100
Wd: D00100
−
1
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...