MC9S12E Motorola, MC9S12E Datasheet - Page 126

• Manufacturer Part Number: MC9S12E
• Description: MC9S12E-Family Device User Guide V01.04
• Manufacturer: Motorola

Device User Guide — 9S12E128DGV1/D V01.04
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 Figure B-3.
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:
126
0
t
min1
t
nom
t
max1
1
nom
J N
( )
Freescale Semiconductor, Inc.
is at its maximum for one clock period, and decreases towards zero for larger
For More Information On This Product,
=
Figure B-3 Jitter Definitions
max 1
Go to: www.freescale.com
2



J N
( )
–
t
t
-------------------- -
N t
minN
max
t
=
maxN
⋅
------- -
nom
j
( )
1
N
3
N
+
,
j
2
1
–
-------------------- -
N t
t
min
⋅
nom
( )
N
N-1



N