High
−
level Instructions
3
−
264
Precautions when using this instruction
If data is received which exceeds the capacity of the buffer, an operation error will occur.
Example:
If the writing pointer is at the end of the FIFO buffer
K101
K100
0
DT0
DT1
DT2
DT3
DT4
DT6
0
1
2
3
DT7
4
▲
K 5
K 4
K101
K102
K103
4
DT5
0
DT0
DT1
DT2
▲
DT3
DT4
DT6
0
▲
1
2
3
DT7
4
K 5
K 5
K100
K102
K103
0
DT5
Execution of
F117 (FIFW)
instruction
Writing pointer shifts
WR0
Number of stored data
Writing pointer
K104
K104
Reading
pointer
▲
Writing
When the F117 (FIFW) instruction is executed, after data is
written to the final address (4) in the buffer, the writing pointer
becomes the first address (0).
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Summary of Contents for FP-X
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