Chapter 6 Applied Instructions
6-237
API
Instruction code
Operand Function
1101 SFTL P
S, D, n
1
, n
2
Shifting the states of the
devices to the left
Device
X Y M S T C HC D L SM SR E PR K 16#
“$” DF
16-bit instruction (9 steps)
AH500 AH500 -
Symbol:
S
：
Initial device in which the value is shifted Bit
D
：
Initial device in which the value is shifted Bit
n
1
：
Length of the data which is shifted Word
n
2
：
Number of bits forming a group Word
Explanation:
1. The states of the n
1
bit devices starting from D are divided into groups (n
2
bits as a group), and
these groups are shifted to the left. The states of the n
2
bit devices starting from S are shifted
to the devices starting from D to fill the vacancy.
2. Generally, the pulse instruction SFTLP is used.
3. The operand n
1
should be within the range between 1 and 1024. The operand n
2
should be
within the range between 1 and n
1
.
Example 1:
1. When X0.0 is switched from OFF to ON, the states of the sixteen bit devices starting from M0
are divided into groups (four bits as a group), and these groups are shifted to the left.
2. The shift of the states of the bit devices to the left during a scan is illustrated as follows.
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