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Device User Guide — 9S12DT128DGV2/D V02.16
124
Freescale Semiconductor
Figure A-4 Jitter Definitions
The relative deviation of t
nom
is at its maximum for one clock period, and decreases towards zero for larger
number of clock periods (N).
Defining the jitter as:
For N < 100, the following equation is a good fit for the maximum jitter:
Figure A-5 Maximum bus clock jitter approximation
2
3
N-1
N
1
0
t
nom
t
max1
t
min1
t
maxN
t
minN
J N
( )
max 1
t
max
N
( )
N t
nom
⋅
---------------------
–
1
t
min
N
( )
N t
nom
⋅
---------------------
–
,
⎝
⎠
⎜
⎟
⎛
⎞
=
J N
( )
j
1
N
--------
j
2
+
=
1
5
10
20
N
J(N)
Содержание MC9S12A128
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