MC9S12H256VFVE Datasheet, PDF (111/130 Pages) Freescale Semiconductor, Inc – Original Release Date: 29 SEP 2000 Revised: 28 JUL 2008

MC9S12H256 Device User Guide — V01.20
0
1
2
3
N–1
N
t_min1
t_nom
t_max1
t_minN
t_maxN
Figure A-3 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:
J(N)
=
⎛
max_⎜
⎝
1 – ^t-N-m-----_â‹^a---t^x-_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
J(N)
15
10
20
N
Figure A-4 Maximum bus clock jitter approximation
111