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Increment/Decrement Instructions Section 3-9
Description The ++BL(595) instruction adds 1 to the 8-digit BCD content of Wd+1 and
Wd. The content of the specified words will be incremented by 1 every cycle
as long as the execution condition of ++BL(595) is ON. When the up-differen-
tiated variation of this instruction (@++BL(595)) is used, the content of the
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 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 changes from 9999 9999 to 0000 0000.
Flags
Precautions The content of Wd+1 and Wd must be BCD. If it is not BCD, an error will occur
and the Error Flag will be turned ON.
Examples Operation of ++BL(595)
In the following example, the 8-digit BCD content of D201 and D200 will be
incremented by 1 every cycle as long as CIO 0.01 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+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 9 to 0 during exe-
cution.
OFF in all other cases.
D201 D200 D201 D200
0.01
CIO 0.01
D200
Increment Increment Increment Increment
Wd+1: Wd: Wd+1: Wd:
: Execution of ++BL(595)
Incremented every cycle
while CIO 0.01 is ON.
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