Справочник Пользователя для Mitsubishi Electronics QCPU

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.5 Reducin

g Instr

uction Pr

oce
ssing
 Time

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.5.1 Subset Processing

Reducing Instruction Processing Time

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