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PC312XDP512F0CFVR Datasheet(PDF) 1270 Page - Freescale Semiconductor, Inc

Part # PC312XDP512F0CFVR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC312XDP512F0CFVR Datasheet(HTML) 1270 Page - Freescale Semiconductor, Inc

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Appendix A Electrical Characteristics
MC9S12XDP512 Data Sheet, Rev. 2.21
1272
Freescale Semiconductor
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:
For N < 1000, the following equation is a good fit for the maximum jitter:
Figure A-5. Maximum Bus Clock Jitter Approximation
This is very important to notice with respect to timers, serial modules where a prescaler will eliminate the
effect of the jitter to a large extent.
JN
()
max 1
t
max
N
()
Nt
nom
⋅
-----------------------
–
1
t
min
N
()
Nt
nom
⋅
-----------------------
–
,
⎝⎠
⎜⎟
⎛⎞
=
JN
()
j1
N
--------
j2
+
=
1
5
10
20
N
J(N)



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