|
MC9S12P32CFT Datasheet, PDF (524/566 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers | |||
|
◁ |
Electrical Characteristics
0
1
2
3
N-1
N
tmin1
tnom
tmax1
tminN
tmaxN
Figure A-2. Jitter Deï¬nitions
The relative deviation of tnom is at its maximum for one clock period, and decreases towards zero for larger
number of clock periods (N).
Deï¬ning the jitter as:
J(N)
=
â
maxâ
â
1
â
t-N-m-----â
-a--t-nx----(o--N--m---)
,
1
â
-Nt--m---â
--i-t-n-n---(-o-N---m--)-
â
â
â
For N < 100, the following equation is a good ï¬t for the maximum jitter:
J(N) = ---j-1----
N
J(N)
1
5
10
20
N
Figure A-3. Maximum Bus Clock Jitter Approximation
NOTE
On timers and serial modules a prescaler will eliminate the effect of the jitter
to a large extent.
S12P-Family Reference Manual, Rev. 1.13
524
Freescale Semiconductor
|
▷ |