MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 620

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Appendix A Electrical Characteristics
The relative deviation of t
number of clock periods (N).
Defining the jitter as:
For N < 100, the following equation is a good fit for the maximum jitter:
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.
620
0
t
min1
t
nom
t
max1
J(N)
nom
1
J N
Figure A-4. Maximum Bus Clock Jitter Approximation
is at its maximum for one clock period, and decreases towards zero for larger
1
=
max 1
5
Figure A-3. Jitter Definitions
2
J N
10
–
MC9S12Q128
t
-------------------- -
N t
Rev 1.09
t
=
minN
max
t
maxN
------- -
j
nom
1
N
3
N
+
,
j
2
1
–
20
-------------------- -
N t
t
min
nom
N
N-1
N
Freescale Semiconductor
N