參數(shù)資料
型號: 9S12KT256DGV1
英文描述: MC9S12KT256 Device User Guide
中文描述: MC9S12KT256設(shè)備用戶指南
文件頁數(shù): 109/126頁
文件大?。?/td> 7307K
代理商: 9S12KT256DGV1
Device User Guide — 9S12KT256DGV1/D V01.09
109
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:
NOTE:
From the evaluation data a formula for t
max
= f(N), resp. t
min
= f(N) should be
derived.
Assuming no long term drift of the reference clock, the following will hold
This is very important to notice with respect to timers, serial modules where a pre-scaler will eliminate the
effect of the jitter to a large extent.
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
N
lim
0
=
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