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S9S12G128F0CLF Datasheet, PDF (1104/1158 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual | |||
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Electrical Characteristics
0
1
2
3
N-1
N
tmin1
tnom
tmax1
tminN
tmaxN
Figure A-3. Jitter Deï¬nitions
The relative deviation of tnom is at its maximum for one clock period, and decreases towards zero for larger
number of clock periods (N).
Deï¬ning the jitter as:
J(N)
=
â
maxâ
â
1
â
t-N-m-----â
-a--t-nx----(o--N--m---)
,
1
â
N-t--m---â
--i-t-n-n---(-o-N---m--)-
â
â
â
For N < 100, the following equation is a good ï¬t for the maximum jitter:
J(N) = --j--1---
N
J(N)
1
5
10
20
N
Figure A-4. Maximum Bus Clock Jitter Approximation
NOTE
On timers and serial modules a prescaler will eliminate the effect of the jitter
to a large extent.
1104
MC9S12G Family Reference Manual, Rev.1.10
Freescale Semiconductor
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