MC9S12XDP512CFU
Model | MC9S12XDP512CFU |
Description | 16-BIT, FLASH, 40MHz, MICROCONTROLLER, PQFP80 |
PDF file | Total 1348 pages (File size: 8M) |
Chip Manufacturer | PHILIPS |
Appendix A Electrical Characteristics
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:
t
(
N
)
t
(
N
) ⎞
⎛
max
min
J
(
N
)
= max
⎜
1
–
---------------------- , 1
–
----------------------
⎟
-
-
N
⋅
t
N
⋅
t
⎝
nom
nom
⎠
For N < 1000, the following equation is a good fit for the maximum jitter:
j
1
J
(
N
)
=
-------
+
j
-
N 2
J(N)
1
5
10
20
N
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.
MC9S12XDP512 Data Sheet, Rev. 2.21
1272
Freescale Semiconductor