While Loop Statement - Hitachi NT2021XA Instruction Manual

Chapter 2 Syntax
- Processing cycle
Refer to the statement execution sequence indicated by parenthesized numbers in the comment fields of the sample programs
below.
(1) : The "for" line is executed only once.
(2) and (3) : <instruction set>
(4) : <variable>
executed. Then,
is executed). When repeating the loop, processing returns to the first instruction of
(5) : This step is executed in the next cycle.
(6) to (10) : These steps are repeated in the same way as the preceding loop execution.
(11) : Processing proceeds to the following step (line).
- Sample program
Label Mnemonic
for
Y(00)=
Y(00)=
next
Y(00)=

while loop statement

- Format
Format
while <condition>
<instruction set>
wend
- Explanation
This instruction executes
before the execution of
executing <instruction
- Sample program (Condition "X (00) = 0" is met after the loop is executed twice.)
Label Mnemonic
while
Y(00)=
Y(00)=
wend
Y(00)=
is executed.
is incremented in the cycle that follows the cycle in which the last instruction of
<variable> is checked to determine whether to exit the loop (in other words, the next statement
parameter1 parameter2
U(00) 0
1
0
1
Instruction to conditionally execute a pre-conditioned loop
This instruction executes
Note that
set>.
<instruction set> repeatedly as long as
<instruction set>. If <condition>
set>.
Is <condition>
Execute
parameter1 parameter2
X(00) =
1
0
1
parameter3 parameter4 parameter5
3 1
Description
<instruction set>
<condition> is checked before the execution of
<condition>
is not met, processing proceeds to the wend statement without
No
met?
Yes
<instruction set>
parameter3 parameter4 parameter5
1
2-12
<instruction set>
<instruction set>
Sequence of execution
(1)
(2)
(5) (8)
(3)
(6) (9)
(4)
(7) (10)
(11)
while <condition>
<instruction
is met. Note that <condition>
Sequence of execution
(1)
(5) (9)
(2) (6)
(3)
(7)
(4)
(8)
(10)
is
in this cycle.
is met.
is checked