Delta-electronics Extension Digital I/O Module DOP-EXIO14RAE Manual de usuario descargar pdf (Pagina 127)

Appendix D Use of Application Instructions|DOP-EXIO Series

D-46

Revision March, 2008, Doc. Name: 2007PDD23000014

CMP D0 D2 M0

SUB D0 D2 D4

SUB D2 D0 D4

Remarks:

Negative value and its absolute value

a) The sign of a value is indicated by the highest (most left) bit in the register. 0 indicates that the

value is a positive one and 1 indicates that the value is a negative one.

b) NEG instruction is able to convert a negative value into its absolute value.

00 0000000000 0100

00 0100000000 0000

00 0000000000 0000

(D0=2)

(D0=1)

(D0=0)

111 1 1 111 1 11111 1 1

(D0=-1)

00 0100000000 0000

(D0)+1=1

111 1 1 111 1 11111 1 0

(D0=-2)

00 0000000000 0100

(D0)+1=2

111 1 1 011 1 11111 1 1

(D0=-3)

00 0100000000 0100

(D0)+1=3

111 1 1 011 1 11111 1 0

(D0=-4)

00 1000000000 0000

(D0)+1=4

111 1 1 111 1 01111 1 1

(D0=-5)

00 1100000000 0000

(D0)+1=5

100 0 0 100 0 00000 0 1

(D0=-32,765)

11 1111110111 1011

(D0)+1=32,765

100 0 0 100 0 00000 0 0

(D0=-32,766)

11 1011110111 1111

(D0)+1=32,766

100 0 0 000 0 00000 0 1

(D0=-32,767)

11 1111110111 1111

(D0)+1=32,767

100 0 0 000 0 00000 0 0

(D0=-32,768)

(D0)+1=-32,768

100 0 0 000 0 00000 0 0

Max. absolute value is 32,767

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 156 157

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