Delta DVP-SS2

3. Instruction Set
3-91
d) D4 is then able to remain positive.
X0
CMP D0 D2 M0
M0
SUB D0 D2 D4
M2
SUB D2 D0 D4
M1
Detailed explanations on negative value and its absolute value
1. MSB = 0 indicates the value is positive while MSB = 1 indicates the value is negative.
2. NEG instruction can be applied to convert a negative value into its absolute value.
0 0 0 00 0 0 00 0 0 0 0 10 0
0 0 0 10 0 0 00 0 0 0 0 00 0
0 0 0 00 0 0 00 0 0 0 0 00 0
(D0=2)
(D0=1)
(D0=0)
1 1 1 1 1 11 1 1 11 1 1 1 1 1
(D0=-1)
0 0 0 10 0 0 00 0 0 0 0 00 0
(D0)+1=1
1 1 1 1 1 11 1 1 11 1 1 1 1 0
(D0=-2)
0 0 0 00 0 0 00 0 0 0 0 10 0
(D0)+1=2
1 1 1 1 1 01 1 1 11 1 1 1 1 1
(D0=-3)
0 0 0 10 0 0 00 0 0 0 0 10 0
(D0)+1=3
1 1 1 1 1 01 1 1 11 1 1 1 1 0
(D0=-4)
0 0 1 00 0 0 00 0 0 0 0 00 0
(D0)+1=4
1 1 1 1 1 11 1 1 01 1 1 1 1 1
(D0=-5)
0 0 1 10 0 0 00 0 0 0 0 00 0
(D0)+1=5
1 0 0 0 0 10 0 0 00 0 0 0 0 1
(D0=-32,765)
1 1 1 11 1 1 10 1 1 1 1 01 1
(D0)+1=32,765
1 0 0 0 0 10 0 0 00 0 0 0 0 0
(D0=-32,766)
1 1 1 01 1 1 10 1 1 1 1 11 1
(D0)+1=32,766
1 0 0 0 0 00 0 0 00 0 0 0 0 1
(D0=-32,767)
1 1 1 11 1 1 10 1 1 1 1 11 1
(D0)+1=32,767
1 0 0 0 0 00 0 0 00 0 0 0 0 0
(D0=-32,768)
(D0)+1=-32,768
1 0 0 0 0 00 0 0 00 0 0 0 0 0
Max. absolute value is 32,767