412
Increment/Decrement Instructions Section 3-10
specified words is incremented only when the execution condition has gone
from OFF to ON.
The Equals Flag will be turned ON if the result is 0000 0000, the Carry Flag
will be turned ON when a digit changes from F to 0, and the Negative Flag will
be turned ON if bit 15 of Wd+1 is ON in the result.
Both the Equals Flag and the Carry Flag will be turned ON when the content
of changes from FFFF FFFF to 0000 0000.
Flags
Examples Operation of ++L(591)
In the following example, the 8-digit hexadecimal content of D00101 and
D00100 will be incremented by 1 every cycle as long as CIO 000000 is ON.
Operation of @++L(591)
The up-differentiated variation is used in the following example, so the content
of D00101 and D00100 will be incremented by 1 only when CIO 000000 has
gone from OFF to ON.
Wd+1 Wd Wd+1 Wd
Name Label Operation
Error Flag ER OFF
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 F to 0 during
execution.
OFF in all other cases.
Negative Flag N ON if bit 15 of Wd+1 is ON after execution.
OFF in all other cases.
D00101 D00100 D00101 D00100Wd+1: Wd: Wd+1: Wd:
Increment Increment Increment Increment
: Execution of ++L(591)
Incremented every cycle
while CIO 000000 is ON.
D00101 D00100 D00101 D00100
@++L
Wd+1: Wd: Wd+1: Wd:
Increment Increment
Incremented only for
up-differentiation.
: Execution of @++L(591)
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