Appendix D Use of Application Instructions|DOP-EXIO Series
D-52
Revision March, 2008, Doc. Name: 2007PDD23000014
Mnemonic Operands Function
SFTL
S
D
n
1
n
2
Bit Shift Left
Bit Devices Word Devices
X Y M S K H KnX KnY KnM KnS T C D E F
S
D
n
1
n
2
y Note:
1. Range of n
1
: 1~ 1,024
2. Range of n
2
: 1~ n
1
16-bit instruction (9 Steps)
SFTL
Continuous
execution
32-bit instruction
- - - -
y Flags: None
Operands:
S
: Start No. of the shifted device
D
: Start No. of the device to be shifted
n
1
: Length of data to be shifted
n
2
: Number of bits to be shifted in 1 shift
Explanations:
This instruction shifts the bit device of n
1
bits (desired length for shifted register) starting from D to the
left for
n
2
bits. S is shifted into D for n
2
bits to supplement empty bits.
Program Example:
When X0 = Off→On, M0 ~M15 will form 16 bits and shifts to the left (4 bits as a group). The figure
below illustrates the left shift of the bits in one scan.
n M15 ~ M12 → carry
o M11 ~ M8 → M15 ~ M12
p M7 ~ M4 → M11 ~ M8
q M3 ~ M0 → M7 ~ M4
r X3 ~ X0 → M3 ~ M0 completed
X
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