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371
Increment/Decrement Instructions
Section 3-10
of the specified words is decremented only when the execution condition has
gone from OFF to ON.
The Equals Flag will be turned ON if the result is 0000 0000 and the Carry
Flag will be turned ON when a digit changes from 0 to 9.
Flags
Precautions
The content of Wd+1 and Wd must be BCD. If it isn’t BCD, an error will occur
and the Error Flag will be turned ON.
Examples
Operation of – –BL(597)
In the following example, the 8-digit BCD content of D00101 and D00100 will
be decremented by 1 every cycle as long as CIO 000000 is ON.
Operation of @– –BL(597)
The up-differentiated variation is used in the following example, so the BCD
content of D00101 and D00100 will be decremented by 1 only when
CIO 000000 has gone from OFF to ON.
Wd+1
Wd
Wd+1
Wd
Name
Label
Operation
Error Flag
ER
ON if the content of Wd+1 and Wd is not BCD.
OFF in all other cases.
Equals Flag
=
ON if the result is 0000 0000 after execution.
OFF in all other cases.
Carry Flag
CY
ON if a digit in Wd+1 or Wd went from 0 to 9 during exe-
cution.
OFF in all other cases.
Decremented every cycle
while CIO 000000 is ON.
: Execution of
− −
BL(597)
Decrement Decrement
Decrement Decrement
Wd: D00100
Wd+1: D00101
Wd: D00100
Wd+1: D00101
−
1
Decremented only
for up-differentiation.
: Execution of @
− −
BL(597)
Decrement
Decrement
@
− −
BL
Wd: D00100
Wd+1: D00101
Wd: D00100
Wd+1: D00101
−
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 ...