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5 -14
(difference) obtained from addition (subtraction) is different from the usual negative number representation. When the
operation result is a negative value, 0 can never appear in the MSB of the sum (difference) operand. The carry flag
represents the positive value 32768 (2147483648) and the borrow flag represents the negative value
−
32768
(
−
2147483648).
Negative Value
(MSB=1)
Positive Value
(MSB=0)
0 Flag
=1
xxx
,
−
2
,
−
1
,
−
32768
,
(
−
2147483648)
,
−
2
,
−
1
,
0
,
1
,
2
,
,
32767
,
0
,
1
,
xxx
(2147483647)
Borrow Flag=1
Carry Flag=1
x
x
MSB
↓
x
x
LSB
↓
x
x
C=1
B=0
Z=0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
32769
C=1
B=0
Z=0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
32768
C=0
B=0
Z=0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
32767
C=0
B=0
Z=0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
32766
C=0
B=0
Z=0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1
32765
x
x
x
x
x
x
x
x
x
x
C=0
B=0
Z=0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
2
C=0
B=0
Z=0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
1
C=0
B=0
Z=1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
P
o
sit
ive
V
a
lu
e
C=0
B=0
Z=0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
−
1
C=0
B=0
Z=0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
−
2
x
x
x
x
x
x
x
x
x
x
C=0
B=0
Z=0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
−
32766
C=0
B=0
Z=0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
−
32767
C=0
B=0
Z=0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
−
32768
C=0
B=1
Z=0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
−
32769
C=0
B=1
Z=0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
−
32770
x
x
x
x
x
x
N
egat
iv
e
Val
ue
C = Carry
B = Borrow
Z = Zero
Содержание FBs Series
Страница 78: ...MEMO ...
Страница 111: ...4 6 X0 X1 Node A Y0 Y1 Node B differential down Incerse differential up t Scan time Inverse t t ...
Страница 141: ...Basic Function Instruction 6 16 FUN 2 SKP SKIP START FUN 2 SKP Y2 Y1 Y0 T201 10S X0 X1 X2 0 10 0 ...
Страница 305: ...MEMO ...
Страница 348: ...MEMO ...