MC9S12E128MFC View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
MFG CO.
'MC9S12E128MFC' PDF : 156 Pages View PDF
Device User Guide — 9S12E12F8rDeGeV1s/DcVa0l1e.04Semiconductor, Inc.
accordingly.The adjustment is done continuously with no abrupt changes in the clock output frequency.
Noise, voltage, temperature and other factors cause slight variations in the control loop resulting in a clock
jitter. This jitter affects the real minimum and maximum clock periods as illustrated in Figure B-3.
0
1
tmin1
tnom
tmax1
2
3
tminN
tmaxN
N-1
N
Figure B-3 Jitter Definitions
The relative deviation of tnom is at its maximum for one clock period, and decreases towards zero for larger
number of clock periods (N).
Defining the jitter as:
J(N)
=
max
1 – t-N-m-----⋅a---tx-n--(--o-N--m---) ,
1
–
N-t--m---⋅-i--nt--n-(--o-N---m-)-
For N < 100, the following equation is a good fit for the maximum jitter:
J(N)
=
---j-1---
N
+
j2
126
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