Motorola MC9S12GC-Family - Manual (Page 114)

Device User Guide — 9S12C128DGV1/D V01.05
114
Figure B-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 B-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)