Chapter 6 Applied Instructions
6-245
API
Instruction code Operand Function
1105 SFRD P
S, D, n
Shifting the data and reading it from
the word device
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
16-bit instruction (7 steps)
Symbol:
S
：
Initial device Word
D
：
Device in which the data is shifted Word
n
：
Data length Word
Explanation:
1. The data in the n word devices starting from the device specified by S is defined as a first in,
first out data type, and the device specified by S is taken as a pointer. When the instruction is
executed, the value in the device specified by S decreases by one, the data in the device
specified by S+1 is written into the device specified by D, the data in the devices specified by
S+n-1~S+2 is shifted to the right, and the data in the device specified by S+n-1 is unchanged.
When the value in the device specified by S is equal to 0, the instruction does not process the
reading of the data, and the zero flag SM600 is ON.
2. Generally, the pulse instruction SFRDP is used.
3. The operand n should be within the range between 2 and 512.
Example:
1. When X0.0 is switched from OFF to ON, the data in D21 is written into D0, the data in
D29~D22 is shifted to the right, the data in D29 is unchanged, and the value in D20 decreases
by one.
2. The data in the word device is shifted and read in the following way.
The data in D21 is read and shifted to D0.
The data in D29~D22 is shifted to the right.
The value in D20 decreases by one.
D0 D29 D28 D27 D26 D25 D24 D23 D22
D21
D20
n=10
The data is read.
Pointer
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