Delta-electronics Extension Digital I/O Module DOP-EXIO14RAE Uživatelský manuál stáhnout pdf (Strana 112)

Appendix D Use of Application Instructions|DOP-EXIO Series

Revision March, 2008, Doc. Name: 2007PDD23000014 D-31

Mnemonic Operands Function

SUB D

Subtraction

Bit Devices Word Devices

X Y M S K H KnX KnY KnM KnS T C D E F

          

       

y Note:

1. If S

, S

and D are used in device F, only 16-bit instruction is

applicable.

16-bit instruction (7 Steps)

SUB

Continuous

execution

32-bit instruction (13 Steps)

DSUB

Continuous

execution

y Flags: M1020 (Zero flag)

M1021 (Barrow flag)

M1022 (Carry flag)

Operands:

: Minuend

: Subtrahend

: Remainder

Explanations:

1. This instruction subtracts S

and S

in BIN format and stores the result in D.

2. The highest bit is symbolic bit 0 (+) and 1 (-), which is suitable for algebraic subtraction.

3. Flag changes in binary subtraction

In 16-bit instruction:

a) If the operation result ＝ 0, zero flag M1020 = On.

b) If the operation result ＜ –32,768, borrow flag M1021 = On.

c) If the operation result ＞ 32,767, carry flag M1022 = On.

In 32-bit instruction:

a) If the operation result ＝ 0, zero flag M1020 = On.

b) If the operation result ＜ –2,147,483,648, borrow flag M1021 = On.

c) If the operation result ＞ 2,147,483,647, carry flag M1022 = On.

4. For flag operations of SUB instruction and the positive/negative sign of the value, see the

explanations in ADD instruction on the previous page.

Program Example 1:

In 16-bit BIN subtraction:

When X0 = On, the content in D0 will minus the content in D10 and the remainder will be stored in D20.

SUB D0 D10 D20

Program Example 2:

In 32-bit BIN subtraction:

When X10 = On, the content in (D31, D30) will minus the content in (D41, D40) and the remainder will

be stored in (D51, D50). D30, D40 and D50 are low 16-bit data; D31, D41 and D51 are high 16-bit

data.

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 156 157

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