MC9S12DB128VFU 查看數據表（PDF） - Motorola => Freescale

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MC9S12DB128VFU

MC9S12DT128 Device User Guide V02.12

Motorola => Freescale 

MC9S12DT128 Device User GuFidree—eVs0c2.a12le Semiconductor, Inc.

0

1

tmin1

tnom

tmax1

2

3

tminN

tmaxN

N-1

N

Figure A-3 Jitter Definitions

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:

J(N)

=



max



1 – t-N-m-----⋅a---tx-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

Figure A-4 Maximum bus clock jitter approximation

122

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