MC9S12NE64CPVE Datasheet, PDF (521/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64 Device Overview

Reset, Oscillator, and PLL 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:
J(N)
=
⎛
max_⎜
⎝
1 – ^t-N-m-----_â‹^a---t^x-_n--⁽--_o-N--_m--⁾- ,
1
–
N-t--^m---⋅^-i--nt--_n^-(--_o^-N---_m^-)-
⎞
⎟
⎠
For N < 100, the following equation is a good fit for the maximum jitter:
J(N)
=
---^j--¹--- +
N
j₂
J(N)
15
10
20
N
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.
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
521