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3.5 Reducing Instruction Processing Time
3.5.1 Subset Processing
3.5 Reducing Instruction Processing Time
3.5.1 Subset Processing
Subset processing is used to place limits on bit devices used by basic instructions and
application instructions in order to increase processing speed.
However, the instruction symbol does not change.
To shorten scans, run instructions under the conditions indicated below.
(1) Conditions which each device must meet for subset processing
(a) When using word data
(b) When using double word data
(c) When using bit data
*1: Only for Universal model QCPU
*2: Valid only for the multiple CPU high speed transmission area (from U3En\G10000)
(Excluding the case that indexing is executed for the head I/O number of the CPU module (U3En\G10000))
Device Condition
Bit device
• Designates a bit device number in a factor of 16.
• Only K4 can be designated for digit designation.
• Does not perform indexing.
Word device
• Internal user device.
• File register (R, ZR *
1
)
• Multiple CPU shared device *
1
, *
2
• Index register (Z) / Standard device register (Z) *
1
Constants • No limitations
Device Condition
Bit device
• Designates a bit device number in a factor of 16.
• Only K8 can be designated for digit designation.
• Does not perform indexing.
Word device
• Internal user device.
• File register (R, ZR *
1
)
• Multiple CPU shared device *
1
, *
2
• Index register (Z) / Standard device register (Z) *
1
Constants • No limitations
Device Condition
Bit device • Internal user device (indexing possible)
Word device
• Bit specification of internal user device
• Bit specification of file register (R, ZR *
1
)
• Bit specification of multiple CPU shared device *
1
, *
2