SC9S12XS256J1MAA FREESCALE [Freescale Semiconductor, Inc], SC9S12XS256J1MAA Datasheet - Page 689
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SC9S12XS256J1MAA
Manufacturer Part Number
SC9S12XS256J1MAA
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.SC9S12XS256J1MAA.pdf
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A.6.3
A.6.3.1
With each transition of the clock f
voltage to the VCO is adjusted accordingly.The adjustment is done continuously with no abrupt changes
in the clock output frequency. Noise, voltage, temperature and other factors cause slight variations in the
control loop resulting in a clock jitter. This jitter affects the real minimum and maximum clock periods as
illustrated in
The relative deviation of t
number of clock periods (N).
Defining the jitter as:
Freescale Semiconductor
0
Phase Locked Loop
Figure
Jitter Information
t
min1
t
nom
t
max1
A-4.
nom
1
is at its maximum for one clock period, and decreases towards zero for larger
J N
( )
S12XS Family Reference Manual, Rev. 1.09
cmp
, the deviation from the reference clock f
=
Figure A-4. Jitter Definitions
max 1
2
⎛
⎜
⎝
–
t
---------------------- -
N t
max
t
minN
t
⋅
maxN
nom
( )
N
3
,
1
–
---------------------- -
N t
t
min
⋅
nom
( )
N
⎞
⎟
⎠
N-1
ref
is measured and input
Electrical Characteristics
N
689
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